Travel less affordable to some, housing more affordable to others.
What is more visible as due to COVID this flats become available for a normal rental.
Obviously AirBnB, booking.com are only one of factors.
so are hotels, parking lots, malls, and everything else that take space right?
Residents of a city (via local government) may have some influence on hotel/mall/parking lot construction but this fails when anyone may buy apartments and starts hotel there anyway.
Eurozone and US Central Bank policies are more-or-less "Cash is Trash" so markets react by throwing their savings at literally any asset that can, at least in theory, preserve value, including real estate.