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 62.2 (raw 47.0 of 100), calibrated so the best hotel in this edition (Santa Monica Proper Hotel) reads 90. Evidence retrieved 2026-10-22.
Sleep14.0 / 24
The room as an instrument for deep, uninterrupted, circadian-aligned rest.
Mattress & sleep system
Hotel-reported · in the best room
HOGO sleep system: beech, merino wool, coconut fibre, 100% latex, cashmere, organic cotton (Royal and Presidential Suites).
Bedding & textiles
Hotel-reported · in the best room
Organic cotton within the HOGO system.
Sleep programme & pillow menu
Hotel-reported · in the best room
Sleep Medicine Unit (Dr Vicente Mera); choice of mattresses and pillows.
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.
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
HOGO graphite-and-silver mesh with earthing, presented as EMF mitigation (claim, not a measurement); phones banned in common areas.
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
Hotel-reported · across the property
Smoking prohibited throughout the facilities; EUR 500 fee for smoking in a suite.
Fragrance-free & low-allergen rooms
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
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.
0.0 / 5 pts
Unknown
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
Nourishment8.0 / 10
Food and drink that heal rather than merely please.
Organic & local sourcing
Hotel-reported · across the property
Organic, seasonal, fresh produce.
Clean-ingredient standard
Hotel-reported · across the property
No red meat, dairy, sugar or additives; mostly plant-based; personalised plans.
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
Hotel-reported · across the property
Nutrition Unit; personal nutrition consultant and meal plan.
Movement4.0 / 10
The means to train, stretch and move, indoors and out.
Gym completeness
Hotel-reported · across the property
Fitness Area; equipment and hours not published.
Classes & studios
Hotel-reported · across the property
Yoga among the natural therapies.
Swimming
Hotel-reported · across the property
Swimming pools.
Outdoor activity
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Holistic Wellness14.0 / 19
Healing traditions and the recovery technology that complements them.
Spa facility
Hotel-reported · across the property
Redesigned hydrotherapy circuit (contrast therapy); treatment-room count not published.
Traditional & integrative modalities
Hotel-reported · across the property
Acupuncture, osteopathy, shiatsu, reflexology, biological medicine.
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
Near-infrared thermal therapy.
Cold therapy
Hotel-reported · across the property
Cryotherapy.
Photobiomodulation & PEMF
Hotel-reported · across the property
Photobiomodulation.
Clinical longevity (IV, HBOT, diagnostics)
Hotel-reported · across the property
Advanced diagnostics, genomic and regenerative medicine on site; IV and hyperbaric not named.
Materials & Setting5.0 / 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
Suites reimagined with natural materials.
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
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
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
Mediterranean coast; clean-air microclimate.
Walkability & low-impact mobility
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
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
- 2 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.
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 hotel says: ‘Smoking is strictly prohibited throughout the SHA facilities’, all suites are smoke-free, and evidence of smoking in a suite brings a €500 cleaning fee.
Our note. Suite terraces are not named separately, 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: Hotel website: FAQsUndated · read 22 Oct 2026
Opening windows
Hotel-reportedonly some rooms or areas
The hotel says: The Presidential Suite has a spacious private terrace with a jacuzzi.
Our note. The Superior and Grand Suites are described with terraces elsewhere on the hotel’s site; the entry-level Deluxe Suites are not, and opening windows are not mentioned.
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 2: Hotel website: Presidential SuiteUndated · read 22 Oct 2026
Filtered fresh air
Not yet reviewed.
In-room air purifier
Not yet reviewed.
No in-room combustion
Not yet reviewed.
So far, the hotel says: The Royal Suite’s rooftop has a living-dining area with a fireplace.
Our note. The fireplace is on the rooftop and its fuel is not stated; other suites are not described.
How we know
What we look for. No gas fireplaces, candles or incense in guest rooms.
Why it matters. In homes with gas appliances, the US EPA notes that indoor nitrogen dioxide often exceeds outdoor levels, and that it irritates the eyes, nose, throat and airways. Candles and incense burn in the same small, closed room.
Source: US EPA, Nitrogen dioxide’s impact on indoor air quality ()
Source 3: Hotel website: Royal SuiteUndated · read 22 Oct 2026
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.
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.
So far, the hotel said in 2023: Organic cotton is among the materials of the HOGO sleep system.
Our note. No certification is named, and the hotel’s bed linen in general is not described.
How we know
What we look for. Sheets and towels certified to a residue-testing standard such as OEKO-TEX Standard 100, or certified organic.
Why it matters. Certifications such as OEKO-TEX Standard 100 test the finished fabric, down to the thread, against a list of restricted substances, which lowers skin exposure over a night’s sleep.
Source: OEKO-TEX, OEKO-TEX Standard 100 (undated)
Source 4: Hotel news: HOGO sleep system in suites9 Mar 2023 · read 22 Oct 2026
Mattress materials disclosed
Not yet reviewed.
So far, the hotel said in 2023: The HOGO sleep system in the Royal and Presidential Suites is made of beech wood, merino wool, coconut fibre, 100% latex, cashmere and organic cotton, assembled by hand.
Our note. How flame-retardancy is achieved is not stated, and other suites’ mattresses are not described.
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 4: Hotel news: HOGO sleep system in suites9 Mar 2023 · read 22 Oct 2026
Hard floors
Not yet reviewed.
Allergy-friendly rooms
Not yet reviewed.
So far, the hotel says: ‘There is a wide choice of mattresses and pillows available to adapt to your needs.’
Our note. Barrier covers, feather-free and hot-washable bedding are not mentioned.
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 1: Hotel website: FAQsUndated · read 22 Oct 2026
Pet-free rooms
Not yet reviewed.
So far, the hotel says: Pets up to 5 kg may stay for a daily fee; they may not be walked through common areas such as the clinic, restaurant, pools and lifts.
Our note. No pet-free suites or separate cleaning routine are described.
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: Hotel website: FAQsUndated · 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.
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: The property has swimming pools and a hydrotherapy circuit.
Our note. Whether pools are indoors or outdoors, and how the water is treated, is not described.
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 1: Hotel website: FAQsUndated · 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.
Garden or organic produce
Hotel-reportedacross the property
The hotel said in 2022: During its Green Globe certification the hotel reported that ‘99% of food and beverage products are organic’, and named biodynamic gardening through its organic garden.
Our note. Reported in 2022; how much of the kitchen’s produce the garden supplies is not stated.
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 5: Hotel news: Green Globe certificate7 Feb 2022 · 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: Guests are asked to keep noise to a minimum, especially from 2 to 4 pm and after 10 pm, and mobile phones are not allowed in common areas.
Our note. Blackout shades and sound insulation are 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 1: Hotel website: FAQsUndated · read 22 Oct 2026
Radio-quiet options
Not yet reviewed.
So far, the hotel said in 2023: The HOGO system includes a graphite and silver mesh with an earthing system, which the hotel presents as reducing electromagnetic exposure.
Our note. Wi-Fi is free throughout the property, and no way to switch it off in a suite is described. We do not review the EMF claim.
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 4: Hotel news: HOGO sleep system in suites9 Mar 2023 · 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 said in 2024: The designer describes the Grand Suites as using ‘stone, stucco, fibres and linen’.
Our note. Paints, adhesives, coatings and flooring are not described in emissions terms; other suites are said only to use natural materials.
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 6: Hotel news: Grand Suites by Lázaro Rosa-Violán16 Jan 2024 · read 22 Oct 2026
Leak and mold response
Not yet reviewed.
Building certification
Not yet reviewed.
So far, the hotel said in 2022: The hotel announced that it had received the Green Globe sustainability certificate, which is audited on site every two years.
Our note. Green Globe is a tourism sustainability programme, not a building standard. The announcement is from 2022, no level is given, and we could not find SHA on Green Globe’s own site, so current status is not confirmed.
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 5: Hotel news: Green Globe certificate7 Feb 2022 · 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
- Hotel website: FAQs, Undated · read 22 Oct 2026
- Hotel website: Presidential Suite, Undated · read 22 Oct 2026
- Hotel website: Royal Suite, Undated · read 22 Oct 2026
- Hotel news: HOGO sleep system in suites, 9 Mar 2023 · read 22 Oct 2026
- Hotel news: Green Globe certificate, 7 Feb 2022 · read 22 Oct 2026
- Hotel news: Grand Suites by Lázaro Rosa-Violán, 16 Jan 2024 · read 22 Oct 2026
- Hotel website: SHA Spain, Undated · read 22 Oct 2026
- Hotel website: Sleep Medicine, Undated · read 22 Oct 2026
- Hotel website: Sleep Well pack, Undated · read 22 Oct 2026
- Hotel website: autumn season offer, 21 Sept 2026 · read 22 Oct 2026
Room count: Not stated on the hotel’s own site. Hotel website (opens the hotel’s website)
Photographs: SHA Wellness Clinic; SHA Wellness Clinic; SHA Wellness Clinic; SHA Wellness Clinic; SHA Wellness Clinic; SHA Wellness Clinic
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