First of all, I should say Isik is very nice and kind person. He was there at the time we had fixed before and he showed the place to us. He was almost available on the phone and he was flexible on arrival and departure time.
The place is a beautiful apartment with an old France architecture. It is very close to Taksim and Metro station (2 min walk). It is in the one of the beautiful and old places of Istanbul, Taksim.
The house was furnished with beautiful antique stuffs. If you are interested in old and antique stuffs you should try it.
We had great time in Istanbul and in the apartment as well.
Thanks to Isik and thanks to lovely Istanbul :)