Here

The address on google map is somehow not so accurate. It should be Nakiye Elgün Sokak No 47, Merkez Mahallesi, 34381 Şişli, İstanbul.

It is very close to Osmanbey Metro.
When you come out from the Metro, go to the direction of Rumeli Cd, then to the exit of Halaskargazi Caddesi.

The house is walking distance of one block from the exit of Osmanbey Metro.

When you arrive, enter to the door between two carparks entrance (like shown in the arrow on the picture). Normally the door downstairs never shut down. We will make sure the door is opened.

Then go upstairs to the house number 6.
There is no bell, so you can just knock on the door.