I'm a 26 year old engineer from Belgium.
Again Robin was nice and clean. I would host him and any of his frieds a third or fifth time.
Robin is an experienced traveler... Knows what he wants, so it helps to be an efficient host.
At first i was a little scared hosting 6 guys looking for party. They were a nice surprise though left the place in good condition and seemed to be fun.
I would host everey one of them again, also as a group.