We really liked our stay at the Dream Flats. Although we didn't have the room pictured, the room we had was comparable (lacking only a sofa). It was quite spacious, with very usable storage, excellent air conditioning and good Wi-Fi.
The flats are opposite a small shop selling water, fruit, baklava, etc. down some narrow, dirty but safe-feeling streets from the pedestrianised restaurant and shopping strip leading to Taksim Square.