Gokcen and Murat are amazing hosts, they are very helpful and friendly.
The apartment is very clean and spacious.
The location is perfect, you're very close to the ferry station, the bus stations and you might not even need to use transportation because everything is near you from the fish market to the bosphorus cafes and much more.
We stayed in Gokcen's apartment for over a month and it was a great month, there is nothing like living in Uskudar.
The people in the street are very friendly and the area is safe.
In conclusion, if you want to stay in istanbul for any period of time, stay here, you won't regret it.