The flat is really convenient for the stay in Istanbul. We were only two, but the flat can comfortably suit up to 4 people. five will be a bit tight, but still ok. There is everything needed in the kitchen.
We had the transfer from the Ataturk airport organized by Hikmet. This is a good idea, since we didn't know how to find the apartment by ourselves. On the way back we took public transport.
The flat is close to the mosque, so be ready to listen to the prayers 5 times a day. On the first day it was a bit annoying, but later we started to enjoy it. This is a good way to immerse the culture.
There are several small shops and a mini supermarket not far away. Only a few minutes walk to the Blue Mosque and Hagia Sophia, all the other main attractions are also pretty close.
Hikmet was very kind, visited us when we had some questions, showed us the most important points in the city center, even brought us a bottle of water when we arrived early in the morning after our long flight.
I can highly recommend this flat for staying in Istanbul. Reasonable price and very comfortable.