@Gábor5
Please, check in a few days if the guest still have the bad review...
In this post, there was a cheating guest.
He booked for 1 but they were 3 and the host mentionned it in his review and Airbnb removed the review of the host and left the bad review of the guest who put 1 star on the host profile !
https://community.withairbnb.com/t5/Hosting/To-Clara-Liang-Product-Director-Last-min-cancellation-be...
It's the world in reverse.
When the host complained about it, Airbnb "re appeared" his review on the guest profile.
It seems that when guest have a bad review and there is a complain about it, Airbnb remove the review of the poor cheating or dirty guest.
The cheating guest was fully repaid him and Airbnb gave him a voucher.
As a thank you for cheating?
And obviously he did it again with the next host.
https://www.airbnb.fr/users/show/93960657
Do you have the link of the profile of your guest?
You were right to contact Airbnb about this guest. Let's check Airbnb does not remove the review.