Istanbul is amazing and I do recommend Jonas' apartment! First of all because of the position:it's close to everything, in the heart of the modern city. Then, the apartment is exactly as you can see in the photos, or even better! it's cool and clean and confortable. Jonas is a super host, he welcomed us very nicely and he has been present among all our stay taking care of us and giving a lot of useful tips.
I will definitely come back to Istanbul & I really hope to stay again at Jonas'!