5 stars for everything. The place is really amazing. Very modern, clean (I felt like home here) and the view... Unbelievable. Location could not be better, it is 2 min away from Galata tower. Kitchen has all the necessary amenities and Oktay is so friendly. We got replies to our messages and questions very quickly and he always was able to help. My whole family loved the place and we will be very happy to return if we come back to Istanbul again.
The only thing to note is that the walls and doors are quite thin, so I could hear my family talking in other rooms (but we could not hear the neighbours from other flats). And be prepared to be woken up by calls for pray from nearby mosques. But it is also quite a special and even dreamy experience :)