The evidence
Each criterion with what we found, where we found it and when. Anything we could not confirm says so.
NTH criteria
NTH Framework v1.2. Score 46.3 (raw 35.0 of 100), calibrated so the best hotel in this edition (Santa Monica Proper Hotel) reads 90. Evidence retrieved 2026-10-22.
Sleep9.0 / 24
The room as an instrument for deep, uninterrupted, circadian-aligned rest.
Mattress & sleep system
Hotel-reported · in the best room
Natural mattresses, metal-free beds and adjustable natural slatted frames from Betten Ullmann.
Bedding & textiles
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
Sleep programme & pillow menu
Hotel-reported · in the best room
Pillow menu: stone pine, natural latex, down, hypoallergenic.
Blackout
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Circadian & warm evening lighting
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
In-room red light
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Acoustic quiet
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
EMF & Wi-Fi-off options
Hotel-reported · in the best room
Mains decouplers and good-night switches; Wi-Fi off automatically 11pm to 7am; no DECT phones; sleeping areas measured regularly.
Air2.0 / 12
What you breathe for eight hours a night: filtered, fresh, smoke-free and unperfumed.
In-room purification
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Ventilation & building standard
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Smoke-free policy
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Fragrance-free & low-allergen rooms
Hotel-reported · in the best room
Allergy-friendly rooms with hypoallergenic furnishings.
Water0.0 / 12
Clean water to drink, and to shower and bathe in.
Filtered drinking water
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
Shower & bath filtration
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Gentler pool & hydrotherapy water
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Nourishment6.0 / 10
Food and drink that heal rather than merely please.
Organic & local sourcing
Hotel-reported · across the property
Certified organic cuisine, including the family's own organic farm.
Clean-ingredient standard
Hotel-reported · across the property
Vegetarian vitality dishes; alkaline fasting (Basenfasten) weeks.
Clean minibar & in-room hydration
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Nutrition guidance
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 1 pts
Unknown
Movement7.0 / 10
The means to train, stretch and move, indoors and out.
Gym completeness
Hotel-reported · across the property
Hotel gym.
Classes & studios
Hotel-reported · across the property
Back fitness and Kneipp fitness.
Swimming
Hotel-reported · across the property
Indoor pool and natural swimming pool.
Outdoor activity
Hotel-reported · across the property
Hiking tours from the door; cycling to the lakes.
Holistic Wellness3.0 / 19
Healing traditions and the recovery technology that complements them.
Spa facility
Hotel-reported · across the property
Garden SPA with several saunas; treatment-room count not published.
Traditional & integrative modalities
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
Mind & breath
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Heat therapy
Hotel-reported · across the property
Saunas.
Cold therapy
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Photobiomodulation & PEMF
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Clinical longevity (IV, HBOT, diagnostics)
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
Materials & Setting8.0 / 13
What touches the skin and surrounds the stay: finishes, products, cleaning, and the landscape beyond the door.
Natural, low-VOC finishes
Hotel-reported · in the best room
Natural wood floors, sheep's-wool carpets, solid-wood furniture by the joiner.
Clean bath & body amenities
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Non-toxic spa & nail products
Hotel-reported · across the property
Treatments with natural cosmetics.
Non-toxic housekeeping & plastic-free operations
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Green & blue space
Hotel-reported · across the property
Above the Hopfensee lake with Alpine views.
Walkability & low-impact mobility
Hotel-reported · across the property
Hiking and cycling from the hotel.
Our review
At a glance
- Fragrance
- 5 not yet reviewed
- Air
- 1 hotel-reported, 4 not yet reviewed
- Cleaning & care
- 4 not yet reviewed
- Sleep & materials
- 5 not yet reviewed
- Water & pools
- 4 not yet reviewed
- Food
- 1 hotel-reported, 1 not yet reviewed
- Light & quiet
- 1 hotel-reported, 1 not yet reviewed
- Building
- 3 not yet reviewed
One reported by the hotel; the rest not yet reviewed.
1 hotel-reported24 of 25 not yet reviewed
Counts cover the 25 scored criteria; the other 5 windows are context.
Checked
Read the full profileThe ledger
Fragrance
Added scent is the most common complaint from sensitive guests, and the hardest thing to see on a booking page.
No added fragrance in rooms
Not yet reviewed.
No scent marketing
Not yet reviewed.
Fragrance-free laundry
Not yet reviewed.
Unscented bath products
Not yet reviewed.
Unscented spa options
Not yet reviewed.
So far, the certifier says: The garden spa is described as appealing to the senses with ‘natural materials, soothing light and natural scents’, and treatments use natural cosmetics from Pharmos Natur, Primavera and Marias.
Our note. Natural scents are still fragrance. Whether treatments, saunas and steam can be had unscented is not stated.
How we know
What we look for. Treatments, saunas and steam rooms available without essential oils or scent infusions.
Why it matters. Essential oils are fragrance: the EU’s scientific committee lists several natural extracts, as well as single fragrance chemicals, among established contact allergens. A shared sauna with a scent infusion is hard to avoid.
Source: EU Scientific Committee on Consumer Safety, Opinion on fragrance allergens in cosmetic products ()
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Know something about fragrance here that we don’t? Tell us
Air
What you breathe for eight hours a night: smoke history, fresh air, filtration and anything burning in the room.
Smoke-free property
Not yet reviewed.
So far, the certifier says: The hotel is listed as a non-smoking hotel (Nichtraucherhotel).
Our note. Balconies and terraces are not covered by the listing, so this falls short of the criterion.
How we know
What we look for. No smoking in any guest room, balcony or indoor space.
Why it matters. Tobacco smoke leaves a residue (thirdhand smoke) on surfaces and in dust. A study of California hotels found that non-smoking rooms in hotels that allow smoking elsewhere did not protect non-smoking guests from it.
Source: Matt et al., Tobacco Control, Thirdhand smoke and exposure in California hotels: non-smoking rooms fail to protect non-smoking hotel guests from tobacco smoke exposure ()
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Opening windows
Hotel-reportedonly some rooms or areas
The certifier says: The listing includes rooms with a balcony (Zimmer mit Balkon).
Our note. Which rooms have balconies is not listed; ask when you book.
How we know
What we look for. Guest rooms have windows or doors that open to outside air.
Why it matters. The US EPA lists opening windows, when outdoor air allows, as a way to dilute pollutants released indoors. An opening window lets guests air a room themselves when it smells of cleaning products or new furnishings.
Source: US EPA, Improving indoor air quality ()
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Filtered fresh air
Not yet reviewed.
In-room air purifier
Not yet reviewed.
No in-room combustion
Not yet reviewed.
Know something about air here that we don’t? Tell us
Cleaning & care
How a room is cleaned, treated and prepared, and whether a request for a gentler clean is actually honored.
Low-chemical housekeeping
Not yet reviewed.
So far, the certifier says: The listing records cleaning products carrying an eco-label (Reinigungsmittel mit Umweltzeichen).
Our note. The products and the label are not named, and whether they are unscented or sprayed is not stated.
How we know
What we look for. Unscented, low-hazard cleaning products and no aerosols, with a product list the hotel will share.
Why it matters. In a ten-country study, weekly use of household cleaning sprays was linked to new asthma symptoms in adults. Residue and scent from cleaning also linger for the next guest.
Source: Zock et al., American Journal of Respiratory and Critical Care Medicine, The use of household cleaning sprays and adult asthma: an international longitudinal study ()
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
No ozone or biocide treatments
Not yet reviewed.
Low-chemical pest control
Not yet reviewed.
Sensitive-guest preparation
Not yet reviewed.
Know something about cleaning & care here that we don’t? Tell us
Sleep & materials
The textiles, mattress and floor you spend the night closest to, and how allergen-aware the room is.
Tested or organic bed linen
Not yet reviewed.
Mattress materials disclosed
Not yet reviewed.
So far, the hotel says: Most rooms have natural mattresses and adjustable slatted frames, and the hotel works with the regional bed maker Betten Ullmann; beds come with a temperature-regulating blanket; the association listing adds that beds are metal-free.
Our note. How flame-retardancy is achieved is not stated.
How we know
What we look for. The hotel says what its mattresses are made of and how flame-retardancy is achieved.
Why it matters. Flame retardants have been added to mattresses and seating foam, and the US National Institute of Environmental Health Sciences lists possible effects including endocrine and thyroid disruption. How much a mattress adds to anyone’s exposure is still debated; disclosure lets guests choose.
Source: US National Institute of Environmental Health Sciences, Flame retardants (undated)
Source 2: Hotel website: healthy sleepUndated · read 22 Oct 2026
Hard floors
Not yet reviewed.
So far, the hotel says: Rooms are fitted with ‘natural wood flooring, sheep’s wool carpets and woodworking furniture’.
Our note. Whether the carpets are rugs or wall-to-wall is not stated.
How we know
What we look for. Hard, cleanable floors in guest rooms rather than wall-to-wall carpet.
Why it matters. Dust mites live in carpet, and US health guidance for allergic sleepers is to replace wall-to-wall carpet in bedrooms with bare floors, which can be cleaned completely between guests.
Source: US National Institute of Environmental Health Sciences, Dust mites and cockroaches (undated)
Source 2: Hotel website: healthy sleepUndated · read 22 Oct 2026
Allergy-friendly rooms
Not yet reviewed.
So far, the hotel says: The hotel offers special furnishings for allergy sufferers on request, and the pillow menu includes pillows for allergy sufferers alongside down, natural latex and stone pine.
Our note. Barrier covers for mattresses and pillows, and feather-free hot-washable bedding, are not described.
How we know
What we look for. Allergen-barrier mattress and pillow covers and feather-free, hot-washable bedding, in all or designated rooms.
Why it matters. For dust-mite allergy, US health guidance is to encase mattresses and pillows in allergen-proof covers and wash bedding weekly in hot water (130–140 °F, about 55–60 °C).
Source: US National Institute of Environmental Health Sciences, Dust mites and cockroaches (undated)
Source 2: Hotel website: healthy sleepUndated · read 22 Oct 2026
Pet-free rooms
Not yet reviewed.
So far, the certifier says: Dogs are allowed (Hunde erlaubt).
Our note. Whether any rooms are kept free of dogs is not stated.
How we know
What we look for. Rooms or floors where animals are never allowed, cleaned to a separate routine.
Why it matters. Pet allergen can stay on carpets and furniture for months and travels on clothing. For allergic guests a room animals never enter matters more than any amenity.
Source: US National Institute of Environmental Health Sciences, Pet allergens (undated)
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Know something about sleep & materials here that we don’t? Tell us
Water & pools
Drinking water, shower water and pool air.
Filtered or tested drinking water
Not yet reviewed.
So far, the certifier says: ‘A Grander water treatment is installed throughout the house’, filed under water treatment or energisation, and a Grander water bar is among the inclusions.
Our note. Grander is described as energisation, not filtration, and no testing schedule is published.
How we know
What we look for. Drinking water filtered at the tap or refill station, or treated and tested on site, with filters or tests on a schedule.
Why it matters. Public water systems in California are regulated and monitored by the State Water Board, though older building plumbing can still affect what reaches the tap. Filtration mainly improves taste and removes chlorine, and it replaces single-use bottles; private wells need regular testing.
Source: California State Water Resources Control Board, Division of Drinking Water (undated)
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Water safety plan
Not yet reviewed.
Shower filters
Not yet reviewed.
Shown for information; not scored.
Outdoor or low-chloramine pools
Not yet reviewed.
So far, the hotel says: There is an indoor pool, and the garden spa has a natural swimming pool.
Our note. How the indoor pool is ventilated and its water treated is not stated.
Shown for information; not scored.
How we know
What we look for. Pools are outdoors, or indoor pools have dedicated ventilation and monitored combined chlorine.
Why it matters. Chloramines irritate the skin, eyes and airways, and they build up in the air of indoor pools without enough ventilation. Outdoor pools, and good ventilation for indoor ones, keep levels low.
Source: US CDC, Chloramines and pool operation ()
Source 3: Hotel website: home pageUndated · read 22 Oct 2026
Context, not scored: almost every pool in this catalog is outdoors, so it says little about one hotel against another.
Know something about water & pools here that we don’t? Tell us
Food
Allergen care first; where the produce comes from second.
Allergen-aware kitchen
Not yet reviewed.
So far, the certifier says: With advance notice the kitchen caters for vegetarian, vegan or specific intolerances, and alternatives are clearly marked.
Our note. Allergen labelling of the full menu and cross-contact steps are not described.
How we know
What we look for. Menus labeled for major allergens, with documented steps to prevent cross-contact.
Why it matters. Most food-allergy reactions are mild, but any can progress to anaphylaxis, which can be life-threatening. US law recognizes nine major allergens; clear labeling and kitchen discipline are what keep a guest safe.
Source: US FDA, Food allergies: what you need to know ()
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Garden or organic produce
Hotel-reportedacross the property
The hotel says: The kitchen combines ‘food from our family’s own organic farm with regional products from organic farmers, certified organic producers and business partners’; the association listing records the cuisine as certified organic, inspected by ABCERT (DE-ÖKO-006).
Shown for information; not scored.
How we know
What we look for. A meaningful share of the kitchen’s produce is grown on site or certified organic.
Why it matters. A large review found detectable pesticide residues about four times as often in conventional crops as in organic ones. Over a short stay the difference in exposure is small, so we show this as a note on the kitchen, not a scored health factor.
Source: Barański et al., British Journal of Nutrition, Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses ()
Source 3: Hotel website: home pageUndated · read 22 Oct 2026
Kitchen note, not scored.
Know something about food here that we don’t? Tell us
Light & quiet
Darkness and silence at night, and radio-quiet options for guests who want them.
Darkness and quiet
Not yet reviewed.
So far, the hotel says: During the redesign of the rooms, ‘the lighting plan and options for blocking the light were taken into account’ for graduated evening and night lights.
Our note. Sound insulation is not described.
How we know
What we look for. Blackout shades and sound insulation that let the room become properly dark and quiet.
Why it matters. Night-time noise fragments sleep; the WHO’s night noise guidelines set a target of 40 dB outside the bedroom. A dark, quiet room is the simplest sleep aid there is.
Source: WHO Regional Office for Europe, Night noise guidelines for Europe ()
Source 2: Hotel website: healthy sleepUndated · read 22 Oct 2026
Radio-quiet options
Hotel-reportedacross the property
The hotel says: Every room has mains decouplers and good-night switches; the low-radiation Wi-Fi access point can be switched on and off in the room and is switched off centrally from 11pm to 7am; there are no DECT phones, and the sleeping areas are measured regularly.
Our note. Listed as an amenity, not a health benefit.
Shown for information; not scored.
How we know
What we look for. Wi-Fi that can be switched off in the room, or a wired connection. Listed as an amenity only.
Why it matters. Some guests prefer lower radio exposure. The WHO says current evidence does not confirm any health effects from low-level electromagnetic fields, so we list these options as amenities, not as health benefits.
Source: World Health Organization, Radiation: electromagnetic fields ()
Source 2: Hotel website: healthy sleepUndated · read 22 Oct 2026
Not part of any health score. Shown as an amenity at the guest’s preference.
Know something about light & quiet here that we don’t? Tell us
Building
The materials a hotel was built and renovated with, how it handles damp, and what third parties have certified.
Low-emitting materials
Not yet reviewed.
So far, the hotel says: Rooms are fitted mainly with ‘natural and durable’ materials: natural wood flooring, sheep’s wool carpets and furniture made by a joiner. The association listing ticks Baubiologie (building biology) and solid-wood furniture.
Our note. Paints, adhesives and finishes are not described.
How we know
What we look for. Low-VOC paints, adhesives, finishes and flooring specified in construction or renovation.
Why it matters. Paints, varnishes and adhesives release volatile organic compounds, formaldehyde among them, most heavily when new. Low-emitting products reduce that load.
Source: US EPA, Volatile organic compounds’ impact on indoor air quality ()
Source 2: Hotel website: healthy sleepUndated · read 22 Oct 2026
Leak and mold response
Not yet reviewed.
Building certification
Not yet reviewed.
So far, the certifier says: The association listing ticks Baubiologie (building biology) under construction, alongside a renovated older building.
Our note. No building certificate or certifier is named. The hotel’s certifications cover its organic kitchen (ABCERT, Bioland) and medical wellness.
Shown for information; not scored.
How we know
What we look for. A third-party certification such as WELL, LEED or a green business program, recorded with its level, and its year where the certifier gives one.
Why it matters. WELL assesses air, water and light in occupied buildings. LEED and green business programs are mainly environmental, with some indoor-quality elements. A certificate records what was designed or checked at a point in time, not what a room is like today.
Source 1: Biohotels association: hotel listingUndated · read 22 Oct 2026
Context only. A certificate supports specific criteria only where its scope covers them.
Know something about building here that we don’t? Tell us
Notes & sources
- Biohotels association: hotel listing, Undated · read 22 Oct 2026
- Hotel website: healthy sleep, Undated · read 22 Oct 2026
- Hotel website: home page, Undated · read 22 Oct 2026
Room count: Per the Biohotels association listing. Hotel website (opens the hotel’s website)
Photographs: Biohotel Eggensberger; Biohotel Eggensberger; Biohotel Eggensberger; Biohotel Eggensberger; Biohotel Eggensberger; Biohotel Eggensberger
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