We live in Western Australia and have a small but cute house in a French medieval town. We rent it out to pay the taxes, etc and just had the guests from hell, Tim and Tanya Davies, who are also Superhosts!
Briefly, they broke the keysafe and front door lock, damaged the fence and bedroom curtain and left food waste on the floors. All in 4 days.
They didn't report the damage, became abusive when asked about the damages and mess, and then denied it, despite the photos taken by our local managers!
So they just gave us a lousy review, complete with personal abuse included.
I gave them a factual review in response and have claimed the Host Guarantee payment.
The hardest thing is that they also called our local managers dishonest, and they don't get a right of reply. They are decent people and had to bust a gut to repair the mess before the next guests arrived.
I have n't filed a police report, but its not a bad idea.
These are the only such guests in 7 years of hosting, so we think of all the great reviews and comments that we've had, and accept that there are some ugly people out there.