I spent several months in Rostock as a student back in the 90s. It coincided with the time when FC Hansa ("Wir lieben dich total!") were in the 1. Bundesliga, and we went to a few matches at their very old-fashioned, mostly roofless stadium. I gather they've got a shiny new one these days.
The Mecklenburg-Vorpommern region is stunning, incidentally. Definitely explore if you go. The very beautiful island of Ruegen isn't far away.