This tool lets you filter an Airbnb search result by any number of their "hidden" amenity codes. Whether you want a place with something common like a dishwasher, or super rare like a kayak...
Be warned that many hosts don't fill in all their amenities so use with caution, especially for the rare ones.
Perform a search on Airbnb with all the options you can (date, place, etc.) then paste the URL above.
Enter comma-separated codes above, or select from the list below
Credit goes to this reddit thread for providing the list of codes and the technique. If any more codes are discovered in future, use the CSV input above to add them manually to your URL.