I had the same type of situation. The guest booked fo 3 people. My clearly stated polict on the site is $50 for each additional guest per night. At 9:30 on the night of the start o the reservation, the guest informed me that they'd be 5 instead of 3 people. He said he'd leve $100 on the counter when he left. We informed him that he had to pay through Air BnB and that the charge would be $200. He refused to make the requisite change. Air bnB has gotten involved. I am anxious to see how this gets resolved. The person was a horrible guest- noisy, disrespectful. He did not seem to understand the difference between Air BnB and a hotel/motel, which is where he should have stayed.