The apartment is great, exactly as in the photos. It was very clean, the kitchen was fully equipped, although we did not cook, just coffee... some extra points to the options of cafeteria (italian and french press). There was a heatwave during our stay, but inside the apartment was very pleasant.
It is located on the top floor (4th) and there is only access through stairs, what was absolutely fine for us, but may not work for some people. Very close to s-bahn/bus stops and very central, super easy to go around the city.
We had a great time staying at Kiki's place, the only downside was that neither my friend or I could connect to the wi-fi. Also, Kiki didn't reply our message very quickly (a day or so), so we had to find a café to have our online meeting... not much convenient, but fine. So, if internet is a must just double check if it is working. Overall, the place is great and I would recommend it.