Stayed here for two nights. Added an extra package to receive flowers, sparkling rosé wine and a bunch of other treats. Also got an upgraded room, which was very nice!
Food: The breakfast is very good, with a large selection of everything you expect from a German hotel. Nice atmosphere with lots of restaurants nearby which are open pretty late, even on weekdays. A rare thing if you're from Sweden.
Service: Excellent! Friendly and diligent staff.
Location: The park outside the hotel was full of life and people. Perfect if you want to just sit outside and enjoy the weather with a beer in the sun. We got a room on the 15th floor facing the railway, but even as a light sleeper that didn't bother me. A bonus is that you have the Heinrich Hertz Tower near the hotel, which you can use as a landmark to find the hotel from anywhere.
Remarks: The only negative was the AC in the room, which couldn't handle the very hot and humid summer days (around 28C degrees), but that's always tough. The small fridge couldn't hold very much beer or water. Not a huge problem because the in house bar is good, and you always have restaurants and stores that sell cold beer or wine.
Parking is offered by the hotel, but there's also parking in the street for €11.50/day (09:00-24:00).