I really enjoyed my stay at Guliz's place. She is a very nice person to talk to, always willing to give you any kind of advice you need. Her apartment is located in Beyoglu/Cihangir, walking distance from several metro or tram stops with all you need within close neigborhood. Cafes, restaurants, bars, shops, galleries, you name it, everything is nearby.
If you are searching for a calm place to stay at while having access to all you need, go for it. Bonus: there is a cute little balcony belonging to the room.