I had a guest who checked in, and couple hours later, she complained we had flea in the bedroom. I offer the option that she could cancel the reservation. She cancelled, and I called Airbnb to give her full refund. But my pest control came and checked the house, there is no flea in the whole house. She left me a review. According to Airbnb, she has right to leave review as long as she acturally entered the house. In the guest's review, she claims there is flea in all rooms of the house and all beds, which is not true. She also warn anyone not to book my property. I called Airbnb customer service several times, even with the false information, the case manager still think it's not against Airbnb policy. What should I do to protect myself as a host?