Sadik's flat is super comfy and its location is just perfect: close to Istiklal street and Taksim Square Metro Sation. You can also walk to Tophane tram station or Galata Tower, an area packed with cozy cafes. And regarding Sadik, he is a lovely person, very talktive and open minded, if I went back to Istanbul I would like him to be my host again!
:)