Isik is a great host!
He came to meet us at the shuttle bus station from the airport and, on the way home, he showed us the neighborhood and his suggestions for buying food, having breakfast and dinner.
At home he explained everything very clearly, not only about the apartment but also how to get to the interesting places in town.
The location of the apartment is perfect; near Taksim square with a few nice restaurants and shops in the same block. The three stories you have to climb up to the apartment is not a problem, specially in a city like Istanbul where everywhere you walk is uphill or downhill.
In summary, a great experience!