@Kitty39
Sorry to hear about that. I noticed that you don't have much in the way of house rules. I understand why you would want to keep them brief, but my rules include that guests are required to tidy up after themselves, with a short description of what that means. I also do an in-person tour on check in, where I go into a bit more detail about my expectations on cleanliness. This is especially important with long term guests. If they are not following those instructions, they will get a polite and friendly reminder about it.
Have you tried speaking to your current guest yet about the condition of the listing? If so, how did he respond?