@Linda3307
Unfortunately, you'll receive little, if any help from Airbnb. So, the burden is on you to work this out in your best interests.
You didn't indicate what "mood" this guest appears to be in... are they going to write a bad review no matter what? Or is the relationship salvageable in any way?
Airbnb won't help you with that either. Guests can say whatever they want, and there need not be a word of truth in it. So think through this carefully.
Confronting guests more often than not results in bad reviews. So if you think some sort of diplomacy might make all things better, then that should be your first approach.
Otherwise, if you're going to get a bad review anyway, and no help from Airbnb, maybe you might consider just telling the guest to leave? You probably will have to pay the guest back in full. You'll get a bad review. You will be penalised by Airbnb in some way.
No, it's not fair... But if this one is intolerable...