We stayed one night at the Novum, having booked with Booking.com and getting a rate of 85 Euro for what turned out to be a very nice, large room at the back of the hotel (Room 210) which was spotlessly clean. The TV had all German channels (no CNN, BBC etc so don't plan on staying in to watch English TV!! There was no kettle etc .
The breakfast buffet was excellent, in a pleasant dining room next to reception.
The location is very convenient, a 3 minute walk from the train station and underground. It is however in the middle of sex shops etc, literally the small entrance door is sandwiched between two of them! - and a bit intimidating when first seen. But we did feel safe, and the hotel receptionists and staff were very helpful and pleasant. Not an area for families to stay in though, or if you are squeamish! (I was solicited once by a local "lady", which for me at age 62 was actually quite a strange experience that had not happened to me for a long time!!) Overall, a very good value hotel, once you're inside!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC