We loved Istanbul. Here are our points regarding the apartment:
Good
Excellent location for eating, shopping and walking to the sites
Superb view over the Bosphorus
Main bedroom has a very comfortable bed and the room is quiet and has a blackout blind.
Light and warm apartment.
Bad
If you were sleeping in the double bed in the lounge area the street below is exceptionally noisy on Friday and Saturday nights. No blackout blind for large east facing window. Bed was extremely uncomfortable - we ended up putting mattresses from day bed on top.
Shower drain caused bathroom to smell badly.