Hi,
there is one brothel that you should not consider: It is called "Red House" ("Rotes Haus" in German). It is at the corner of Taunusstrasse and Elbestrasse. On most of the German monger pages (
www.strichweb.com), people warn about girls cheating on customers.
Another place you should leave alone is a place called "Hand Organ" ("Leierkasten" in German). The name is a bit misleading. It is probably the largest brothel in the railraod station area, but prices are higher than in the other houses.
Of course you can walk through these brothels, but you probably won't get what the girls will promise you at the doors.
Generally, on the first floor areas of most of the brothels you will find at least some German girls. German girls are usually the most expensive ones. The more you move up in the houses, the cheaper the girls will get. You will find girls mainly from Eastern Europe, from Asia, from the Carribean, and from South America. Some brothels have another house in the back yard right behind the main building. Girls there are usually older - but cheaper.
Some good advice on mongering at the railway station area: Be friendly to the girls, be nice, smile. Watch your pockets and your wallet. Prices usually start at EUR 25,--. Avoid bargaining at the door - offer a bit more, and the girls will leave you alone with asking for more money once inside the room. The girls are there for fast sex. You will get a much better service at EUR 50,-- or EUR 100,--. It will take the pressure from the girls, and from you.
Questions?