Yes, the article should be named "Airbnb guests fail to clean up after themselves, owner outraged". But then I guess it'd be hard to sell it as something worth an article on BBC.

All the rest - the fact that people had sex in the apartment (not exactly out of the normal unless one rents exclusively to monastic orders) or that money may have been exchanged (totally not owner's business) - sounds completely irrelevant and an attempt to foment moral panic.