The apartment is nice, very clean and located in a central area with a lot of shops and restaurants. Everything was good, I will just highlight some details that maybe useful to some future guests:
1. There is a lift, however if you stay in this apartment you will still need to carry your luggage 1,5 floors as it does not go to all the floors. The lift is small (which I guess is normal for Istanbul, most places dont have it at all)
2. The ceiling is low in some places, if you are a little tall you will have to get used to this and lower your head in some areas of the apartment. I had hit my head couple of times when standing up from the bed.
3. If you leave something sweet on the table overnight - ants may come.