Honestly, if you are looking for a quiet place near Taksim (10 min by walk), you are at the right adress. The neighborhood is safe, quiet and all shops are nearby. The flat is very spacious, clean and look alike the pictures.
Perihan was checking on us frequently and asks if everything is ok. The check in was easy, you'll have all the indications 48h before your arrival. The flat was easy to find.
As it is an old building with a wooden floor, you can hear the neighboors upstairs walking, but it's ok, not that much disturbing.
Finally, I recommend this appartment, it's my third time here in istanbul, and it was the best one I stayed in. I would definitely come again. Perihan is the best host you can have.