Did you ask him what happened to his ad? I'd do a face time call to make sure he's legit as far as he is the guy in the pics that were on the ad and don't send any money upfront.
Again I've never done an overnight but I would think sex three times in an overnight would be something like sex upon arrival. Then you have a snack and watch a movie or something. Then sex again after that which could even include some shower play. Then sleeping and then morning sex.
I have a queen bed but need my personal space at night. If I ever did an overnight, which would be a longshot anyway, it'd have to be in a king sized bed for sure.