We had a very pleasant stay in Okan's apartment. The building and the apartment are new, nicely decorated and very well furnished. The panoramic view to the city and Golden Horn is amazing (especially at night). You will find a lot of supermarkets, groceries and fast foods in the area.
Okan is very careful with the security and we felt safe in his place. I came by car in Istanbul and I parked my car in his garage.
There were some things that we needed and we didn't find them in the apartment, but I pointed them out to Okan through a private message.
Taksim place, Galata tower, Metro station - 10 minutes walking.