Basic hotel.
Plus - clean, good TV in the room, big bathroom, etc. The breakfast bar had solid options, continental style. Check-in was very pleasant and quick.
Minus - my room smelled damp and stale. The carpet, although clean, has not been updated for years and all the dirt stains are very noticeable.
Also, my window was on the side street, accepting deliveries until late. I could hear people upstairs.
Generally, this hotel needs an update. If you only care about a good night's sleep, a reasonable price and somewhere to keep your things, while being close to Hannover centre - this will be an ok choice.