The studio is in a great location, very close walking distance to Taksim. It's on the ground floor, so no problem with carrying luggage. Communication with Adnan was very smooth, we also checked in early, which was convenient. The price is very good.
The downside is that the street the flat is on, despite it being a side street, was extremely noisy duirng both nights, with people fighting, screaming, repairing cars etc. Since there's no aircon, there's a trade off between open windows and noise and closed windows and heat.
All in all, i would recommend the flat, just bear in mind the noise in case you are a light sleeper :)