My stay at Isik's place was good.
The location is excellent, close to Taksim which means you can hop on the metro to get to places quickly. Or it is so easy to walk everywhere.
It is a busy part of Istanbul, so be prepared for noise and people at all hours, but for me that is part of the appeal.
The view is also excellent. It is not a luxurious place, but for the price it is a good option when in Istanbul and I would stay again.