I choose Living Room.
It is brown-haired. Because, Red-head was third to arrive and bald guy was second. Bald guy works between 8 am and 6 pm so blond must be the first to arrive(8 am 4 pm). Red-haired guy said none of his brother were there and he was 3rd. That leaves the brown-haired guy, almost at midnight, the last visitor. But I also suspected the little blond brother. Asking for rom? Maybe brown was in this together with blondie. I do not know it is something to think about.