I have studied art management in Istanbul and lived there for 15 years. In last 5 years i used to share my flat in Istanbul with airbnb guests. Then i moved to Berlin in October 2012 to live with my girlfriend who is from Berlin. At the moment i spend my life between Istanbul and Berlin(mostly in Berlin) and renting my old apartment and some other friends flats on airbnb. There are 2 other apartments each can accommodate 6 people; these belong to a friend who manages a suite hotel in Istanbul. He offers cheaper prices then normal because airbnb always offers better guests in our opinion same for our flat in Berlin.
You can check them all and if you see something which you are interested in, i am glad to give informations and welcome you. When i am not in the city my friends will help you about check in and try to give you a good accommodation.
Have a nice trip