If you want to have a really special experience in Istanbul, I recomend you stay in Cha's appartment. First of all, the host is lovely girl, very friendly and polite :) recomended me lot's of places to go and what to do.
The appartment is beautiful (it reminded me of my own place), very cosy and complete. Full kitchen, books, all the amenities that you need.
There's a lovely balcony where you can see lots of thress and hear the birds singing.
The area is very nice, lots of restaurants, stores and cafes. Walking distance from everywhere:)
If you want to feel at home when you're travelling, like I do, I would totally recomend Cha's place :)