Istanbul is an amazing city, but if you'd like to enjoy the proximity of the city and still benefit of a calm and peaceful area, don't hesitate and go at Göktürk ! The neighborhood is very friendly, i mean it, and you'll never have trouble to join the city center at any hours, but you'll also find everything you need in the close neighborhood of this apartment. Cuneyt is the perfect host, he explained everything we need to know (taxi, food, places to see), and always responded quickly when we needed him !
Again, i recommend this place ;]