Sometimes, places I've been to before, where the owners and I know each other.

Another approach is to look on AirBnB and if there is anything, use the images n reverse image search to find the listing on other sites - and often places are on other sites.

Other times, a more general search for the location of interest and see what's there which is simply not on AirBnB, and negotiate discount for long stay.

For the now considerable number of cities where AirBnB has been or has effectively been banned by State, you have to use these approaches anyway - that's how I got into Paris.