Yeah, we had a similar issue with mice at an Airbnb listing in London. Airbnb asked us to send photos to prove it. They ended up settling for pictures of feces in the kitchen. It took a couple of weeks to resolve, and the host seemed mad that we asked them to come to clean up the excrement in the kitchen. In this case, they wouldn't even let us cancel the reservation - we would have needed the host's permission to end the reservation early without fees.