Drunk Guest Messed up Apartment, Lied to Airbnb

I use an electronic lock to let guests in as a largely absent host. The guest locked himself out by inadvertently entering a code that disables the lock until you open it from the inside. This had never happened before in years of using the lock. He called me at 9:27 PM on a Friday night and said the lock was not working. I happened to be there outside in my motorhome set to have taken off that day but got delayed and was prepared to leave in the morning (me being onsite is really unusual). I walked 50 yards to the door, came over, and the lock didn’t work.

I told him I could get him in the other entrance upstairs (that has access to the mechanical area and common laundry). I unlocked that door, walked up the stairs, crossed the apartment down the guest access stairs to the entry area, and opened the door. As I walked through the apartment to the other entrance, I noticed the place was as messy as I have ever seen a place in eight years of hosting; it looked like a tornado hit it with my pillows on the floor, and clothes everywhere. I was shocked.

Nonetheless I kept moving and went downstairs to the door. We tested it a couple of times and it worked flawlessly. I have no idea why it didn’t work (then). I went back to my motorhome and send a text at 9:45, literally 18 minutes after he called. My text said the place was very messy and caused me concern about excess cleaning (they were relatively long stays, 13 days with kids). I asked him to try to be neater so we didn’t have a problem. I said I was glad to be around to get them in. I smelled alcohol on the guy’s breath as we interacted but it wasn’t really a problem; he was fine.

In the morning he wrote Airbnb and claimed I had locked him out to tell him off about being messy and that I had entered his premises illegally without justification. He tried to cancel the reservation and get his money back. I am dealing with this nightmarish guy, who literally will say anything and probably can’t remember much.