I had this happen to me this weekend. A guest booked one month in advance, she booked for one guest. (My listing clearly states to book for the amount of guest at the time of booking,) this weekend she submitted a request to add three additional guest. I modified her price $100 additional for the 3days. Not $100 per day, but $100 for the entire stay. She informed me that after booking for the one guest, she received an offer to invite more guest at the rate she paid. She had a receipt lising the additional guest. I was not aware this could be done without my knowledge or approval. I called Airbnb to inquire how this is possible, since I was not informed, and was only looking to accomadate 1 guest. They said appoved guest can invite verified and recent quest to the reservation. WHAT???!!! Has this happened to anyone else, is this something that is common. I don't like nor appreciate my rules being changed without my knowledge. I had to honor her reservation, but need to get this straight with Airbnb because i don't want any extra people showing up especially since I state in my rules, that if more people show up, the reservation will be canceled.