Almost in all coffee houses that have national cuisine.
We advise you to visit Bebek cafe, which is correctly called Bebek Koru Kahvesi. Reviews of tourists about this place as a cafe, where you can not only taste quite tasty, real Turkish coffee, but also admire the beautiful views of the Bosphorus!
However, we advise you to choose places away from the main tourist routes, and the price will be cheaper.