@Inna22 how totally weird. So you have self check in and don't meet your guests - correct? Well, this reinforces WHY I message and guests message me 30mins. before they arrive so I can give a quick tour . Of course we live in the big house in front and they stay in a cottage.
I would be really calm and challenge them with your Superhost status and how active you are with Airbnb CC and that of course he stayed there - wet towels, and ?? hairs in the sheets?? is there evidence any other way.
Also, this is another reason I don't do one nighters....too much work for the effort with cleaning. Why do you think it had to do with cleaning fee? Did he message something about that? I would talk with a supervisor and push for your monies on this one. Good luck Inna. happy hosting, Clara