This guest is a fraudster. While we have rented our apartments for a very long time on Airbnb, this guest was the worst we have ever hosted.
In short, the most weird thing about him was that he completed his full stay (approximately a month) with us, and after checking out he demanded that we refund 50% of the reservation charges simply because he noticed some discrepancy in the apartment. Normally, when guests have any issue they would bring it to our attention, but this fraudster did not. He even involved Airbnb to seek some money based on false allegations.