Isik was a really great host and responded quickly to all our questions. The apartment is in the 3rd floor of the building (with no elevator) it was exactly as described, clean and spacious. The location was also good, many grocery stores walking distance away, Taksim square,metro and many restaurants are around 150m away.
If you want to have a good time during your stay at Istanbul and feel at home, I recommend Isik's place.