I think all of the AirBnBs I have been to (across a few cities in Europe on vacation), it appears that what happened was one half of a couple moved in with the

I think all of the AirBnBs I have been to (across a few cities in Europe on vacation), it appears that what happened was one half of a couple moved in with the other half, and, with a lease that they couldn't get out of, rented out on AirBnB rather than eating the months of rent for an apartment they wouldn't be living in.