The apartment is located in a very residential area of Beyoglu, on a side street of Omer Hayyam. Do not be put off by the grafitti, the people in the area are very nice and friendly.The apartment unit is exactly as in the photos.
Garen was a very helpful, considerate and good host. He even left fruits and chocolates as a welcome treat.
I would recommend the apartment for groups of up to 8 persons. Note though that the 2nd bathroom is quite tight with the shower directly above the toilet bowl.
All in all, a good place to stay at in Istanbul. Thank you Garen for all your assistance and understanding.