Irem’s studio was a great place to stay and we were very comfortable during or 5 day stay. Especially the location is perfect, with lots of bars and restaurants in walking distance.
The place is quite a bit smaller than it looks on the pictures, but the high ceilings make up for a lot and all though we are relatively tall (1.80-1.95) we did not feel crammed either.
Also, the place is in need of some maintenance. Nothing too serious (a moldy smell from the air conditioning and a few broken curtains) but good to know in case you are sensitive for those kinds of things.
Overall a good option for your stay in Istanbul!