I once shagged a girl standing up in the bathroom hunched over various items stored on the floor. Before we finished, her near naked pal had to squeeze past behind my to get a pee. The girl I was with was smoking hot and giggled almost the whole time. I think it cost about a fiver. A guy in a suit appeared just before I left. He stands at the door of these girls' makeshift, weekend brothel. He looks so out of place that it was hard not to laugh. He bolted after 3 seconds. I've also shagged in some luridly awful rooms with no bedroom door, but where you could have eaten your dinner off the girl's gorgeous flaps. I try to separate service provider and surroundings as one often pays massive premiums simply for the latter. But in the indie (AW) scene in this country, girls living in run down beg-bud-boudoirs charge the same as those in a luxury penthouse flat serving you a chilled chablis before demonstrating their sexual skills.
I don't like places that smell bad. If you do it mile high, try for as early on in the flight as possible.