It was a perfect stay and my wife and I strongly recommend KPM.
Since it’s a hotel room with your own small kitchen, you get free cleaning (so the place is perfectly clean), free access to a gym, and a refillable minibar with Fritz Cola and mineral water. The staff is friendly and helpful. The location is central and is a 5-minute walk to S-Bahn.
The only downside was the lack of soundproofing. For a couple of days, we had people living next to us and it was a bit uncomfortable because of the noise.