Isik was a wonderful host: from the very arrival till the departure he was constantly online, providing us with useful tips. On arrival he brought us the Istanbul Kart to use and local sim cart. And if the host's hospitality wasn't enough - the flat itself was really great: located in the most convenient place, with all the needed amenities. Maybe it was a little bit on a cold side (we arrived in the beginning of March), and if you stayed in the guest room, the noise from the street can be a nuisance, especially early in the morning. But other that that - can't recommend enough.