I absolutely recommend it! It was very interesting! Even if I was travelling alone, I felt very safe. I appreciated all the explanation from the guide but especially from the girl at the prostitute information center, that was the most interesting point of the tour. For sure seeing the girls behind the window was something too.
The negative point was that we were too many in the group and the guide wasn't speaking loud enough to being heard by all of us. He gives information about all the time, which is good but if you want to stop to take a picture not of the girls, you're too far already to hear him. As being a lonely traveler, I wouldn't be aware of a lot of things and facts we learnt during that tour if I wouldn't been part of that. It worth definitely the price. Thanks!