It was very nice to stay in his flat. It is close to Tuyap exhibition hall.
(Walking distance. But, it is even faster if you find Tuyap's back door. If you go to front door it is further than back door.)
His flat was very clean, well organized, very nice to stay. There are many supermarkets near his flat. And if you cross the bridge and walk about 10-15 minutes, there is a big shopping mall as well. There are some restaurants, clothes shops, and supermarket.
Although his flat is perfect, if you are traveller to center of the istanbul, his flat is bit far from the center. You can easily take bus from his flat, but it takes 1hr - 1.5hr to go to the center by bus. (I normally took taxi and it costs about 300TL) If you prefer to stay in an apartment which is clean and has nice view even though it is a bit far from the city center, I would love to recommend this place without any hesitation. His apartment is worth it.
If you came here for business trip to tuyap exhibition hall, it is perfect place to stay.
Omer and his staff was very cooperative, they responsed every messages very fast, and accepted all my request.
I had very memorable stays in Omer's flat. And I would love to stay there again.