Lots of negative media attention to hidden cameras these days. Many guests are very concerned about this and will do strange things. Be sure you have disclosed your cameras correctly in accordance with Airbnb guidelines. If you haven't done that, and a guest complains, your listing can be suspended. Some guests will complain about "hidden" cameras in retaliation for not receiving a refund, or because you charged them for damages. Usually the listing is suspended while Airbnb investigates.