The info Airbnb puts out makes it sound as tho' it's simple to cancel reservations: https://www.airbnb.co.uk/help/article/2022/how-do-penaltyfree-cancellations-work-for-instant-book-ho...
I've never cancelled an IB, but if I needed to, I'd phone CS & ask them to cancel on the basis of not being happy with the guest's past reviews, lack of communication, whatever... I'd do this to try to ensure I wasn't penalized financially. (Too many stories on these boards of hosts who WERE penalized .)
-Last week a first time guest booked with no photo, only a phone no. as verification, no biography, not even his town of residence, nothing! His pre-trip message was "just 1 night between shifts" - better than nothing! I asked him his ETA. - No reply. I messaged again the day before arrival, explaining ETAs were an Airbnb 'thing' .... He did not reply & arrived c. 8pm making excuses that he could not reply cos it asked him to log-in! I COULD have been suspicious of such a guest & cancelled, but these days this scenario is common, & guests increasingly don't understand the need for introductions, mutual exchange & negotiation to ensure a good 'fit', like they probably did when you first hosted, @Ros0 . They think it's like booking a hotel! - And the guest? He wasn't up for talking, kept himself to himself, but no trouble!