From my experience, if there is every any question about the guest's satisfaction, I wait to write a review until they have written one. If there is a problem with a guest I usually never write a review until the matter is resolved, or the 14 days is up and I forfeit the right to write a review. In my experience more often, usually the really nice people take time to write a review. The reason I hold off on writing reviews about less than perfect guests, is because if there was anything wrong with what they did during the stay, say they broke one house rule, you might be inclined to let it slide, but a photo of the problem as documented when you first enter the unit always pays when you have a problem with them writing a rude review. Send the CS agent proof the guest did not follow the rules. See if any of the issues they raised are ones that were somehow covered in the listing description. And always be extremely clear about any problems you have with the listing: a squeaky door, a furniture that needs repaired. Put it into the extra information about the listing. Make sure you confirm that the guest is satisfied when they check in.
The kind of black mail the guy is doing comes back to hurt all hosts and superhosts, because the word gets out that they can do this. I had a similar situation recently a man booked and stayed for three days out of two week booking and he left abruptly, was automatically credited for the remainder of his booking, but he requested a full refund for the days he stayed. I gave him a $25. credit, because only two minor items were not explicitly covered in the listing. Try to break it down to some small amount to credit for each inconvenience and give him a minimal credit, tell him that the amount he is requesting is unacceptable and that you find his behavior to try to extort you as offensive. Set up the narrative for later when the CS agent has to look at the dialog they will read the word extortion and you will be seen as taking fair initiative to protect your listing. Also he may get worried and back down.