I hadn’t a similar problem regarding third-parking booking. Read the thread: Cancelling a guest who now wants to run her business from the premises
In my case the person booking wanted to book her clients to stay in our house and then followed up after accepting with a request to run her workshop/counselling session with him at the house. Turned out she was some kind of sex worker!
In any case, third-party booking is a no-no, but cancelling after accepting affects ratings blah blah blah. All I did was contact Air and tell them the situation, that the guest had misrepresented herself, that I was concerned as a super host about affecting my ratings by cancelling so they cancelled it for me. No harm no foul and always better safe than sorry.
As a teacher and youth development coordinator for the past 20 years I can tell you that teens, while not a dead cert for trouble, cannot be relied upon. I’m also a surfer so I can guarantee you’ll have sand in the sheets, in the shower and possibly in the loo! Yes, prior experience.