I had a guest who checked himself in and claimed to have returned the key, however he seems to have kept it and continued to stay in the place. When my cleaner came to the room he hid in the loft and hid some clothes in the ceiling. He also smoked, despite my strict no-smoking policy; the place reeked of smoke with ash everywhere. He left the apartment in a shocking condition. Of course any attempts to contact Airbnb to warn others are ignored as Airbnb does nothing to help apart from taking fees.
I also recently had a guest who booked for two weeks during the busiest season for my apartment. The shower apparently had a small leak and I was given an hour to solve the issue. Since I was briefly out of signal range I was only able to attend to the issue 90 minutes later, and had a plumber solve it immediately. It was too late; he cancelled the reservation and received a full refund during the busiest season. All attempts to contact Airbnb are unanswered. In fact Airbnb has never returned any of my messages. It’s shocking service all round.