Located in the Moda/Kadikoy district, quite touristy (for the locals) and full of restaurants and bars, you will only have to take a boat to reach the shore opposite (about 20 minutes, 8TL).
Pleasant apartment with terrace overlooking Istanbul, very nice for a drink at the end of the day.
Kitchen available. The room is basic, OK for a 2/3 day stay, with an amazing view of the city and the Bosphorus. Shared bathroom, not necessarily practical when the apartment is full (4/5 people) because the toilets are not separate.
On the other hand, the host is cool and the cat, Biber, is a real love. We miss her already!
PS: be careful, 6 floors to climb on foot (no elevator).
Maybe think about putting a parasol or a canvas to shade the terrace?