@Christopher187 For the content policy have a look here: https://www.airbnb.com/help/article/546/
The relevant prohibited item is this one:
- Content that provides specific details or outcomes of an Airbnb investigation
In this case, "investigation" can be taken to refer to any dispute over payments or refunds that gets escalated to a case manager. So although it seems credible that your review was honest and relevant to future hosts, the mentions of Airbnb's mediation would technically put it over the line in terms of this policy.
Bear in mind, though: nothing in the Content Policy suggests that a breach of it is grounds for any kind of refund. Your guest's refund request is utterly ludicrous, and in your response you can refer to the Guest Refund Policy at https://www.airbnb.com/help/article/544:
- Contact us to bring the travel issue to our attention. If you notice the issue during check-in, contact us within 24 hours. If the issue occurs during your stay, contact us right away. We'll ask you to provide photographs or other documentation that show what you're experiencing.
That is, within 24 hours of check-in, or immediately during the stay, and not two months after check in and certainly not after check-out.
It's at Airbnb's discretion whether to remove the user. Your review should have done the job, but I'm afraid its reference to the dispute will result in it being deleted outright, thus setting the bad guest loose again. Perhaps you might ask for a few lines to be redacted.