We spend in Ozkan's studio 5 days and we like it a lot. You should know that it's located in the ground floor if it important for you. In Studio you can find everything you need! Near the flat there are many national cafes, supermarkets and bakery's. Also bus stations. But underground is quite far by walking.
Ozkan is very nice and helpful, so when we will be in Istanbul again we definitely will choose his flat! :)