We stayed only for three days but we enjoyed our stay very much. The apart is ideally located - there are many cafes, restaurants and stores around, the big bazaar, park and ferry port are close but the apart itself is very quiet. It is also very stylish and full of character, there are a lot of cool artefacts and the whole living room area and bedrooms feel a bit like a fairy-tale. Doğukan himself responded very promtly and helped us with everything we needed.
A couple of things to mention: the first is that the apart is not a pure rental, but a lived-in home, so if you prefer a more hotel-like experience, this probably won't be to your taste. The second is that it's on the fifth floor and the building has no elevator, so if you have heavy luggage - you might want to prepare for the long climb.