The apartment is very nice, clean, comfortable, quiet, a good size, and in a good neighborhood with plenty of restaurants, shops, and supermarkets. There was everything we needed.
The apartment was well heated for the December chill. It is on the first floor (one floor above the street). The location is about a 10 minute walk to Taksim Square.
Kerem is a great host. He speaks excellent English, and was very helpful during our stay, including picking us up at the airport for a reasonable price.
Kerem's Mother even baked us a cake since we were the first guests.