If you want to experie real Istanbul not some touristic mirage, you should definitely contact Kalen and stey in his studio house. The Fatih District is full of live and authenticity, worth to explore on its own rights. It is also nice and exciting walk through the heart of the city to all main touristic atractions. Kalen extremely helpful and very responsive. The place itself is modest but tidy and you have all you need, including AC which is a desirable piece of equipment in the summer night. I can't recommend highly enough.