We had clearly communicated that we would not be physically there, that they could pickup the key and that they would be alone in the house (every other guest would be happy about that). I answered every question, arranged the key pickup, warned him about a party in our street. And then we got complaints about his car that got fined and the noise in the street. But the two days he stayed with us, he didn't ask a single question. I'd like to have helped him, but when i don't receive any question, i can't help him.