This place is located in a very pleasant area in Kadikoy which isn't very far to the train station (Feneryolu) that can get you anywhere in Istanbul. We were in touch with Asil's brother Onat who is a very friendly and helpful guy.
Even though we stayed during a rainy and cloudy week the view didn't fail to impress and the whole house was pretty warm by the radiators that worked 24/7.
Thank you Onat and hope to see you again!