@Ali62 Don't know what issues a guest would have as your listiing is quite lovely! I think you should look at responding to the public review that may identify issues as a marketing opportunity. Do not react defensively! What is the truth of this guest's opinion? Remember, travelers are expressing opinions so you need to acknowledge opinions and "appreciate" the opinion while disputing their observations. Of course sometimes a guest has picked up on a real issue and if you appreciate the observation and state how you are correcting the problem, potential guests will be okay with that. Avoid demeaning the guest...
Go to your Reviews @Ali62 and you will see a place to "Leave a Public Response". I am not sure how long you have to make a response, but I can still do it to a review left a week ago.