Good value for money on a short trip. The apartment is as described. I'd stay again for 1-2 nights for work. The apartment was spotless, and the staff were friendly.
If you're a solo female traveller: the rooms don't have any secondary security locks on them - no bolt lock, chain or other locks. If someone has the keycard, they can come in your room and you can't do anything about it. While I've encountered this elsewhere in Berlin hotels, bring a portable secondary lock (amazon) for safety. There is also no safe and no net curtains (you're overlooked).
The shower floods easily, the apartment can be very hot so I wouldn't have felt safe on ground floor with window open at night (I was 1st floor so no issue), and the cooking pans are cheap and stick - but that is inconvenient rather than a problem in itself, so is fine for a couple of days. The walls are pretty thin and a lot of noise from upstairs, so bring earplugs and it's no problem.
The bed is so comfy and I would stay again!