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 90.0 (raw 68.0 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
Eight Sleep smart mattress with dual-zone climate control, sleep analytics and smart wake (Proper Sleep Room).
5.0 / 5 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
Bedding & textiles
Hotel-reported · in the best room
Hypoallergenic pillows with Italian/Bellino linens across all 262 rooms; fibre content not stated.
Sleep programme & pillow menu
Hotel-reported · in the best room
Proper Sleep Room kit: Slip sleep mask, ELVT mouth patches and nasal strips, Eight Sleep jet-lag supplements, Moonjuice Magnesi-Om.
Blackout
Hotel-reported · in the best room
Custom blackout curtains with bedside blackout controls (Proper Sleep Room).
Circadian & warm evening lighting
Hotel-reported · in the best room
Room designed around circadian rhythm; adjustable lighting; Loftie sunrise-simulation alarm.
2.0 / 2 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
In-room red light
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Acoustic quiet
Hotel-reported · in the best room
Loftie clock with guided sleep sounds and nature soundscapes.
1.0 / 4 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
EMF & Wi-Fi-off options
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Air5.0 / 12
What you breathe for eight hours a night: filtered, fresh, smoke-free and unperfumed.
In-room purification
Hotel-reported · in the best room
Jaspr air purifier with real-time air-quality monitoring, to run continuously (in-room guide).
5.0 / 5 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
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
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
Water10.0 / 12
Clean water to drink, and to shower and bathe in.
Filtered drinking water
Hotel-reported · in the best room
Filterbaby faucet filter pre-installed; guide recommends filtered tap water for skincare and oral care.
5.0 / 5 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
Shower & bath filtration
Hotel-reported · in the best room
Filterbaby shower filter pre-installed (chlorine and heavy-metal reduction).
5.0 / 5 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
Gentler pool & hydrotherapy water
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Nourishment10.0 / 10
Food and drink that heal rather than merely please.
Organic & local sourcing
Hotel-reported · across the property
Organic local and farmers-market produce.
Clean-ingredient standard
Hotel-reported · across the property
Seed-oil-free kitchens, non-GMO proteins, house ferments, low-temperature cooking.
Clean minibar & in-room hydration
Hotel-reported · in the best room
Curated minibar; house-made granola, Autonomy matcha, Moon Juice Magnesi-Om.
2.0 / 2 pts
From the hotel's own pages
Restorative Wellness Room in-room guide (official Proper subdomain)
Nutrition guidance
Hotel-reported · across the property
Personalised wellness itinerary covering nutrition, fitness and recovery.
Movement10.0 / 10
The means to train, stretch and move, indoors and out.
Gym completeness
Hotel-reported · across the property
24/7, 2,500 sq ft; Peloton, Woodway, Technogym, Keiser, Watt bikes, two Pilates reformers; VO2 max testing.
Classes & studios
Hotel-reported · across the property
Complimentary daily classes in Helios Studio: vinyasa yoga, mat Pilates, breathwork, bootcamp.
Swimming
Hotel-reported · across the property
Rooftop pool and sundeck.
Outdoor activity
Hotel-reported · across the property
Electra bikes, beach volleyball, tennis and padel access, coastal sessions.
Holistic Wellness14.0 / 19
Healing traditions and the recovery technology that complements them.
Spa facility
Hotel-reported · across the property
Surya Spa (Ayurvedic), described as nearby; on-property private recovery suites. Treatment-room count not published.
Traditional & integrative modalities
Hotel-reported · across the property
Ayurvedic treatments via Surya Spa.
Mind & breath
Hotel-reported · across the property
Guided meditation and breathwork (Ammortal), breathwork classes, in-room meditation sessions on request.
Heat therapy
Hotel-reported · across the property
Clearlight infrared sauna and private dry saunas (2- and 6-person).
Cold therapy
Hotel-reported · across the property
Cold plunges at varying temperatures; Morozko hydrogen mineral bath.
Photobiomodulation & PEMF
Hotel-reported · across the property
TheraLight 360 red-light bed, Joovv full-body red light, BEMER/Ammortal PEMF.
Clinical longevity (IV, HBOT, diagnostics)
Hotel-reported · across the property
VO2 max testing on site; IV therapy via Drip Hydration concierge partner.
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
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Clean bath & body amenities
Hotel-reported · in the best room
Aesop bath amenities; formulation not described by the hotel.
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
Blocks from the Pacific Ocean and the beach bike path.
Walkability & low-impact mobility
Hotel-reported · across the property
Walkable to the beach; Electra bikes provided.
Our review
At a glance
- Fragrance
- 1 not met, 4 not yet reviewed
- Air
- 5 not yet reviewed
- Cleaning & care
- 4 not yet reviewed
- Sleep & materials
- 5 not yet reviewed
- Water & pools
- 1 hotel-reported, 3 not yet reviewed
- Food
- 2 not yet reviewed
- Light & quiet
- 2 not yet reviewed
- Building
- 1 hotel-reported, 2 not yet reviewed
One not met; the rest not yet reviewed.
1 not met24 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 metin some rooms or areas
The hotel says: The Proper Sleep Room’s features include a Vitruvi diffuser, and aromatherapy is offered as an add-on.
Our note. Other rooms are not described. Ask for the diffuser to be taken out before you arrive.
How we know
What we look for. No air fresheners, plug-ins, room sprays or diffusers used in guest rooms.
Why it matters. In a US population survey, about a third of adults reported health problems, such as migraine and breathing difficulty, from fragranced products. Terpenes in many fragrances also react with indoor ozone to form fine particles and formaldehyde.
Sources: Steinemann, Air Quality, Atmosphere & Health, Fragranced consumer products: exposures and effects from emissions (); Nazaroff & Weschler, Atmospheric Environment, Cleaning products and air fresheners: exposure to primary and secondary air pollutants ()
Source 1: Hotel website: wellness roomsUndated · read 21 Oct 2026
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: It is a non-smoking hotel: smoking is barred from guest rooms, public areas and food and beverage outlets.
Our note. Balconies and terraces are not covered by the published policy, 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 2: Hotel website: guest compendiumUndated · read 21 Oct 2026
Opening windows
Not yet reviewed.
Filtered fresh air
Not yet reviewed.
In-room air purifier
Not yet reviewed.
So far, the hotel says: The Wellness Rooms and the Proper Sleep Room have ‘purifier-equipped air’ and ‘premium air filtration’.
Our note. Whether the units are true HEPA, and whether any emits ozone, is not stated, so this falls short of the criterion. Standard rooms are not described.
How we know
What we look for. A true-HEPA purifier in the room or on request, with no ozone-generating or ionizing function.
Why it matters. Portable HEPA units lower indoor particle levels, which matters most during wildfire smoke. Ionizers and ozone purifiers can add an irritant gas instead.
Sources: US EPA, Guide to air cleaners in the home (undated); US EPA, Ozone generators that are sold as air cleaners ()
Source 1: Hotel website: wellness roomsUndated · read 21 Oct 2026
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.
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.
Hard floors
Not yet reviewed.
Allergy-friendly rooms
Not yet reviewed.
So far, the hotel says: The Proper Sleep Room has hypoallergenic pillows.
Our note. Barrier covers for the mattress and pillows are not mentioned, so this falls short of the criterion.
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: wellness roomsUndated · read 21 Oct 2026
Pet-free rooms
Not yet reviewed.
So far, the hotel says: Pets are welcome for a one-time fee of $100 per pet: two pets at most, up to 45 lb each, and no cats.
Our note. Whether any rooms are kept pet-free, and cleaned to a separate routine, 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 2: Hotel website: compendiumUndated · read 21 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
Hotel-reportedonly some rooms or areas
The hotel says: The Wellness Rooms and the Proper Sleep Room have Filterbaby shower filters and bath filtration.
Shown for information; not scored.
How we know
What we look for. Shower filters that reduce chlorine or chloramine, in rooms or on request.
Why it matters. Some guests with sensitive skin prefer less chlorine in shower water. The health evidence is limited, so we list this as a comfort feature.
Source 1: Hotel website: wellness roomsUndated · read 21 Oct 2026
Comfort feature, not scored.
Outdoor or low-chloramine pools
Not yet reviewed.
Shown for information; not scored.
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
Not yet reviewed.
Shown for information; 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: The Proper Sleep Room has custom blackout curtains, with bedside controls for the shades.
Our note. Sound insulation is not described, so this falls short of the criterion.
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: wellness roomsUndated · read 21 Oct 2026
Radio-quiet options
Not yet reviewed.
Shown for information; not scored.
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.
Leak and mold response
Not yet reviewed.
Building certification
Hotel-reportedacross the property
The hotel says: Its website shows a ‘LEED Silver Certified’ mark.
Our note. Not yet checked against the USGBC project directory. LEED is mainly an environmental certification, and no year is given.
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 3: Hotel website: home pageUndated · read 21 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: wellness rooms, Undated · read 21 Oct 2026
- Hotel website: guest compendium, Undated · read 21 Oct 2026
- Hotel website: home page, Undated · read 21 Oct 2026
Room count: Per the hotel’s website; other listings give 267 or 271. Hotel website (opens the hotel’s website)
Photographs: Alexis Presa (Unsplash License, placeholder image, not the hotel); 一只猫的橘 (Unsplash License, placeholder image, not the hotel); Pushparaj S (Unsplash License, placeholder image, not the hotel)
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