A guest simply didn't arrive. He did not cancel through Airbnb or answer my messages to ask if he was still planning to arrive. The automatic Airbnb "Review Guest" message keeps popping up. I can't review this guest negatively, as he may have had an accident or something. I was still payed for this booking. Do I have to review the guest?
You don't have to leave a review, but in my opinion you should. Simply state that the guest never arrived. And perhaps toss in some humor; something like "on the other hand, the apartment remained immaculate the entire time".