@Latricia1 Yeah, that's unbelievable. Your response is good, though: unemotional and factual. It will help your future guests see the review for what it is: frivoulous and mean-sprited.
One suggestion on vetting your guests: I probably wouldn't have accepted this guest as-is, personally. They're brand new to Airbnb, they have no profile info, and their only verification is an email address. This person has no skin in the game and seems super clueless. You may have had discussions before letting them book, but if not, I would consider insisting on more from guests in future.