I’m surprised AirBnb does not not have an easy way to search for black out curtains. For a few years, I stayed in AirBnb listings, until I had enough of clueless hosts who did not use proper window coverings to block out light.
Last year I spent a week in Alaska at an AirBnb during Summer Solstice. I barely slept, because the short, light-filtering curtains let in a lot of light. There was only 2-3 hours of dark skies each night. I was miserable.
Now I stay at chain hotels, like Marriott or Hyatt brands. at least their designers know to use blackout curtains. If I’m in a remote area, that does not have decent hotels, I scour the listings, and I always send a message to the host and ask if they specifically have blackout curtains. I will not use Airbnb for the most part because of this ridiculous oversight on their part.