I had stayed at the Tianjin Sheraton Hotel during last November (one night only).
When you get out of the hotel and cross the road and turn to the left, then you go towards downtown along a canal which runs along the street, and after about 300 meters you turn right, cross the canal and turn right again to walk a few meters back in the direction from where you came, but on the other side of the water.
There are about 4 or five joints where you have girls waiting for customers.
In one place I liked a girl but due to difficulties in the communication with the mamasan and the girl declining, probably being afraid of not knowing how to communicate, I left there with and just had to go back to the hotel.
Time was about 11 pm on a Sunday night.
It was bloody cold that evening.
So I can´t tell you where to go, but maybe in terms of mongering the Sheraton (otherwise good 5-star hotel!) is not the best place to stay.
For better places in Tianjin others must jump in.
In Beijing I just know the area around the Kempinski Beijing Lufthansa Center Hotel (bloody expensive 5-star hotel, but room, service and restaurants are good).
At night there are a few girls strolling around the outside, looking for business. Looks of the girls, in my view, are so so.
I picked one for short time and she was good and kind, but it was not one of those nights that I would remember forever...
Greetings,
Concerned