@Shirley442 What you should do next? There's nothing to do except forget about it. The review is obviously an outlier and you have already responded to it, although I would have responded differently. Review responses to untrue reviews should be used to correct false statements for the benefit of future guests, not to address the reviewer.
I would have written something like
"I was not even aware that this guest had entered the home, as he simply cancelled without contacting me. It also appears that the guest failed to read the listing description, where it is clearly stated that the back porch is a work in progress. This has not been an issue for any previous guests, as is evident from their reviews."