Stayed with my girlfriend at Esen's apartment. Excellent location. Walking distance to Taxim, 3min to train. Esen, really looked after us, offered us breakfast every morning, and helped with pharmacy needs when my gf was sick. He showed us around Istanbul and gave us a lot of recomendations.
Room was big and clean, just like the rest of the apartment, which Esen was kind enough to let us use. It was a pleasure staying here.