James999 is spot on in his advice esp about the safety of parlours. A parlour I have used got firebombed.
My top tip for picking a girl, would be to look at the seating arrangements and pick the girl the other girls like. She will be the one sitting in the middle. You are much more likely to get a friendly service and definitely ignore any hustler type who will be sitting on the end nearest to the entrance hoping to catch your eye.