We stopped in Hannover on our way from France to Denmark. We looked for a budget hotel with nice rooms, and we were satisfied. I can't comment the location of the hotel, since we just nedded a place to crash for the night, we arrived late and left early the next morning without experiencing anything that Hannover has to offer..
We decided to hit the road without enjoying the breakfast, so we can't comment on the quality of that.
The general feeling was positive!