I spent a day in Warnamuende on a cruise holiday last year, I liked it. There was a tall ships event over the weekend and the place was busy, good atmosphere in the evening with a band playing. We spent a day in Rostock and enjoyed it.......the weather was good so that helped. Didn’t get chance to see much, we were only there for a few hrs, but my impression was favourable.
Maybe the beer helped, of all the destinations (Baltic cruise) we visited it was the only one where the beer was cheap!
Paul