All in all we had a good time at Farzins place. The apartment is really central, clean and for this price a good deal. Its pretty basic and not fancy, but Istanbul clearly is a city where you have better options than hanging out in your apartment. Farzin is really kind and helpful, always near by if you need help.
But if you consider to book this apartement, be aware that the area around this place is part of the prostitution area. I would NOT recomment to travel there alone as a woman. I was there with my girlfriend and we had a few unpleasent situations, alltough I was with her.
Nothing to do with the apartment but the area.