My first booking on Booking.com was from 2 Nigerians with absolutely no indication of being real people (could only find an obscure reference to one of them online) who wanted to stay for 5 weeks in the height of summer season. There was NO way to set max. stays, only minimum. It seemed like an organized scam to show up, drive me crazy and demand to be sent to the Four Seasons at my expense. Which Booking requires you to do.
I called Booking.com and asked to have them canceled and to remove my account altogether. It seemed extremely high-risk for in-home hosts. The ToS calls you to put up a guest who doesn’t work out at a hotel at your expense.