The place of Deniz is very comfortable and complete. It is clean and tidy. The view on the Bosporus is incredible. We really enjoyed sitting on the balcony at night and watch the boats.
Keep in mind that it is on the top floor so you will need to walk quite some stairs. But you will notice soon that walking stairs is part of the day in Istanbul!
For tall people (more than 1,80m) you will need to be careful as the ceiling is low and some lights will be hanging in your way as you walk around in the apartment.