Stayed in Okan's apartment for a week with the family. The apartment was comfortable and in a great location.
All the main historical sites, such as Blue mosque, Topkapi palace, Hagia Sophia and Grand Bazaar are within 5-10 mins walking distance. Eminonu Pier is about 15 mins walk, from where you can catch a boat for venturing along the Bosphorus Strait. We took the day cruise along the Bosphorus Strait and it was a great day out.
The Apartment was clean and most of the amenities were working as expected. Probably, only downside was there was no air conditioning in one of the bedrooms and the entrance to building and the lift are outdated. Do not give a good first impression!
Okan was very responsive host and replied within an hour when we needed any help. He organised the transport to and from the airport, which was spot on and punctual.
We would highly recommend Okan's apartment.