Known amenity codes:
1 - Television
4 - Wifi
5 - Air Conditioning
8 - Kitchen
9 - Free Parking On Premises
12 - Pets Allowed
15 - Gym
23 - Free Street Parking
25 - Hot Tub
27 - Indoor Fireplace
30 - Heating
33 - Washer
34 - Dryer
35 - Smoke Alarm
37 - First Aid Kit
39 - Fire Extinguisher
40 - Essentials 1: towels, bed sheets, soap, toilet paper
41 - Shampoo
44 - Hangers
45 - Hair Dryer
46 - Iron
47 - Dedicated Workspace
51 - Self Check-In
52 - Smart Lock Entry (?)
53 - Keypad Entry (?)
54 - Lockbox
57 - Private Entrance
61 - Bathtub
64 - High Chair
66 - Children's Books & Toys
69 - Fireplace Guards
70 - Babysitter Recommendations
72 - Crib
73 - Room Darkening Shades
74 - Children's Dinnerware
77 - Hot Water
79 - Body Soap
85 - Bed Linens
86 - Essentials 3: extra pillows & blankets
87 - Ethernet Connection
89 - Microwave
90 - Coffee Maker
91 - Refrigerator
92 - Dishwasher
93 - Essentials 4: bowls, plates, cups
94 - Essentials 2: pots, pans, oil, salt, pepper
95 - Oven
96 - Stove
97 - EV Charger
98 - Single Level Home
99 - BBQ Grill
100 - Patio / Balcony
101 - Backyard
102 - Essentials: Beach towels, umbrella, beach blanket, snorkeling gear
103 - Luggage Drop Off Allowed
104 - Long Term Stays Allowed
107 - Cleaning Before Checkout
129 - Host Greets You
132 - Waterfront
133 - Lake Access
137 - Hot Water Kettle
139 - Ceiling Fan
146 - Mini Fridge
153 - Hammock
172 - Kayak
179 - Outdoor Dining Area
185 - Sound System
201 - Bikes
219 - Fire Pit
223 - Sauna
227 - Exercise Equipment
236 - Dining Table
251 - Toaster
258 - Private Pool
280 - Outdoor Furniture
308 - Freezer
322 - Blender
392 - Board Games
394 - Books & Reading Material
415 - Coffee
515 - Ping Pong Table
521 - Pool Table
522 - Portable Fans
527 - Record Player
611 - Shower Gel
625 - Essentials: baking sheet
626 - BBQ Utensils
657 - Conditioner
663 - Laundromat Nearby
664 - Boat Slip
665 - Cleaning Products
667 - Drying Rack For Clothing
671 - Clothing Storage
672 - Wine Glasses
674 - Beach Access
9999 - Security Cameras On Property
Source: https://www.reddit.com/r/AirBnB/comments/y1q3nl/airbnb_customized_advanced_search_multiple/