Joined the Hilton chain in 2022. Formerly under the Crowne Plaza brand.
Had a number of stays during 2022 at this property - HH Diamond.

Good:
- a very well run hotel with many long-serving professional staff who clearly take some pride in their work - always very helpful
- early cki and late cko usually not an issue
- rooms have a good size, and have been refurbished
- nice sauna area and relaxation room
- nice balcony rooms on the top floor
- very close to the main station
- excellent (!) restaurant - it is not the cheapest but definitely worth it

Not so good:
- Hilton Honors breakfast benefit is for continental breakfast only (however, they have good bread rolls and croissants, that eases the pain a little)
EDIT 2023: Full breakfast was available during my recent stays here.

Overall, this is not a destination in itself but definitely a decent business hotel choice for Hannover, and a quality addition to the Hilton brand.