I had a lovely stay but it was completely ruined by the host blaming me and my dog for stains located on a rug. I actually reported the stains during the visit and allowed the host's husband to come and inspect them before I checked out - at that point they were "perplexed" as to what caused the stains. But once I left, they claimed my dog had urinated on the rug and the stains were obviously the result of that. I absolutely dispute this. The host actually has her own dog who could have done this but instead she blamed mine - who has no history of doing any such thing.
Honestly, when I left I told the host this was my best Airbnb experience ever. It was a real shock to be asked to pay several hundred pounds for a new rug shortly after.