I agree on several points made. Contact Apartment Ratings and see if they will remove some or all of the posts from this one person. But, I would also generate a response to the posts from this resident that is not reactive, is very diplomatic, takes responsibility for any truths in the posts as well as the actions taken in response to rectify. If you don't want to pay Apartment Ratings their (extortion) manager fee, just create your own user account and post the reply. In the reply, you can still state your with management although your reply would probably make that perfectly clear. Don't know much on your policy, but if this guy is so miserable, have you offered to release him from his lease? Not saying you should, but when done in extreme situations can be good for you...unless of course you think the guy is just trying to force your hand to get out of his lease.