One of my past guests, a week after he left, wrote to me saying that he would write a very bad review for my Airbnb if I didn't refund more than 70% of his stay. He wrote a long list of things that were wrong with the apartment, but he never contacted me during his stay to let me know of all these problems, other than one problem with the boiler that I solved right away. I am very suspicious because everything he mentioned I could have solved right away if he contacted me. Also, these problems were not apparent with later guests. When they left they thanked me and said they had a great stay. It makes me wonder if I am being conned. I discussed the issue with Airbnb, but despite being a Super-host with excellent reviews they said that they can't do anything, such as stopping the guest from publishing his dubious review. The only thing they did is, as I asked, delete my excellent review of the guest which I wrote prior to the blackmail. What do you suggest I should do? It is not a very large amount since the "guest" stayed only three nights.