This is a fairly typical German style hotel with a twist. Got there early and doors were locked. There was a number to call as you need a code to get in the building when reception isn't open which is only between 1 and 9 pm. They told me that they normally send a code and instructions via text but Expedia didn't send them my phone number. I just needed to leave my suitcase as I was going to my daughter's apartment, so the housekeeping staff allowed me to leave my suitcase in a room by the reception area which because of impending construction is on the second floor. What I liked most about this hotel was the location. It is a 15-20 minute walk from the Hauptbahnhof (main train station) and about a 15 minute walk to my daughter's apartment near the Klinikum.
If you are a lite sleeper be aware this is located on a main road in Mannheim with lots of stores, clubs and restaurants. There was a pair of earplugs in the room but I didn't need them.
Like other German hotels I've been in but room was large. 2 twin beds together with a duvet. Pillows were foam chunks and not comfortable and one pillow kept popping out of the case. Lots of outlets (European type). Room was warm, didn't need the heat on despite being cold outside.
The daily breakfast buffet was standard far with usual German breakfast foods - Muesli, coldcuts, fruit, cheese, eggs, yogurt and great brotchen.