Of course it is, and rightly so. It's completely underhanded to use someone's premises as a brothel without their say-so.

Hotels are facilities which cater for all sorts of people and can cope with all sorts of eventualities. When you rent your house out for the night to a couple, you do not expect them to have used it as a base for prostitution, and should not be as happy to clean up as everybody in this thread seems to be.

I guess we differ here. If you rent your apartment as a hotel room, then you'll have to clean it as a hotel room. The cleaning part is a red herring.

All that remains is, wishing to regulate the morals of the renters. Which is an iffy proposition at best.