I spend a good time in this place !
good points : it is well located, quite in the center, the street near is quite during nights. The owner is answering quickly and is very friendly.
negatives points : when i arrived the sheets for the beds where not clean, the dishes and the floor neither.
Also now that i spoke to several turkish people i know that the price of the appartement is really too expensive compared to the standards here in istanbul
even with those points, if you want a safe place to visite the city whithout being annoyed, that's perfect !