Only time i wouldn't mind this would be if im with a friend and we go at the same time. The noise thing would not bother me at all, its the fact of knowing there is another dude there, that we can meet face to face as you put it, booker in the kitchen would also be a bit akward.
Oh anyway im just very satisfy with my outcall setting, none of this can happen. The only thing that happened once (couple months ago) is when we where done, we heard sex noises from the next room, either it was a couple and we gave them ideas, or the guy called one himself, it didn't sound like porn, and it was not in a place where they got porn on tv anyway.