I made the trip to Hamburg for a Hoffenheim vs St.Pauli match and the fans were really cool, we didn't have any trouble with them. That being said, I think Hansa Rostock has the best fans in that area.
Especially with the display they made in Dresden LINK
It takes some real fricking balls do that there, because 20,000 of those Nazis are gonna be rushing you immediately after the game.
StraightCash, Yeah the Germs here are rich as frick, but I love the city just as much if not a little more then Heidelberg. Both absolutely shite on the land dump/Turk Central that is Mannheim