We had a wonderful stay in Berlin. The location of this apartment is great as it is really near (or on top) of the metro (U9/U7). Within 10 minutes you are in the center. Also in the near area of the apartment there are supermarkets (Lidl, Edeka) a bakery and (good!) restaurants.
The apartment itself:
Albeit clean, the entire apartment smelled of cigarette smoke (al lot).
Also: The pictures make the apartment look better than it's actual state:
The apartment wasn't as modern as we expected. Overall it looked worn-out both on maintenance and equipment: The walls could need a paint job and on the window frames the paint was peeling off. More over the wasmachine didn't work (broken door, missing front), the light of the extractor hood wasn't working (switch is missing). In the fridge the freezer door handle was missing (which made it hard to close well). In short, overdue maintenance.
Finally the bed(s) felt hard partly because it had a very thin (Ikea) mattress. And something not mentioned in the advertisement, you can clearly hear the Metro (U-Bahn) from the bedroom.
On the positive:
The apartment was clean and we had clean sheets and towels also we had handsoap and soap for the dishwasher. The shower was hot and plenty. The kitchen had all utensils (pots and pans). We had a free WIFI connection. Finally, it was a very spacious apartment.