@Alison
I know this won't help you now, but for your future peace of mind...
I have two lock on my door the Guests get the key to only one lock, and I retain the key to the second in the event of similar situations.
If I felt uncomfortable, I could lock the door so they could not gain access without reverting to me.
In your case it might mean a 03:00am phone to let them in, but at least you could relax around not being cleaned out.
Regards
Cormac
The Explorer’s Club Krakow III
The Explorer’s Club Krakow VIII