Demir's apartment is a very spacious, warm and safe place to stay in Kadikoy.
We lived there for one month so we probably have faced issues that will not affect most of the travelers who choose to stay there for short term.
the main problem was that the apartment doesn't have its own internet...
so we had to use the wifi signal that comes from another apartment which affected a lot the signal strength and the speed of the internet.
There are a lot of markets in the neighborhood and big shopping mall in 10 min walking.
The apartment is very close to many kinds of transportation like Bus, Metro, and the most important, the Ferry that we used to cross the Bosphorus.
Istambul is a very beautiful city.