To quote Bettie Davis: "What a dump!"
The "hotel" is on the 2d floor. You get 2 keys: 1 for both the outside door and the 1st floor "hotel" entrance door, 1 for the room.
I don't think the place has been redecorated since the 1970s. The room had 2 beds, a day bed and a sofa, so could accommodate 4 people, and one small table. It seemed more a youth hostel than a "hotel."
There's no air conditioner. The windows opened but no screens and the room was over a train station. The curtains weren't wide enough to cover the windows. There were 2 dim lights, 1 overhead and 1 over the bed; the AC outlet by the beds was a meter above the headboard and situated below the light switch, which means you had to avoid hitting your jacks to turn off the light while lying in bed, if you could reach it (you can't). While the bed was a queen, the duvet-enclosed blanket was a twin.
The shower stall inside the tiny bathroom was barely large enough to lift your elbows. Twice I accidentally hit the faucet simply by turning around and got scalded. The stall doors didn't seal, so the floor got flooded. You got two rough towels; the small bath towel was hardly adequate for an adult.
Two plusses: free breakfast, but I didn't indulge, and the free Wi-Fi was great.
The ONLY advantage to this "hotel" is its location; walking distance to the train, and a 10-minute walk to Messe Berlin.
But, if I were you, I'd pay more and stay farther away at a "real" hotel and avoid this dump.