My worst Airbnb experience happened in Tours, France. I arrived around 21:00 to pick up the key from the box to the apartment just to find out there was no key from it and there was already someone staying in the same apartment. The other guest was surprised too. It happened that this other guest had a cousin living in the same town, so she left the apartment for me.
At first I was happy that I didn’t have to look for another place to stay… until I entered the dirty apartment. There was hair on the sheet, wet towels, and crumbs on the table. The host promised me clean sheets just the next day, but she gave me a refund for a one-night stay. The most ironic part is I got a bad review stating that I left the apartment dirty. I left it the same as I found it and a cleaning fee was included. Not recommended.