We had a wonderful time at this little studio. Location was great, and Fatih was very helpful. The reviews are fairly accurate.
Fatih was gracious enough to meet us around midnight, and gave us a few tips about getting around the city.
A few words of caution, if you get in late, the neighborhood looks VERY scary, completely different than during the day and early evening. Everything is closed up and everything covered in graffiti and posters. We even saw a few teens graffiti our building the night we arrived. The building right next door is old and vacant, and you can see squatters from the apartment window. This was all very disconcerting when we arrived, we almost thought of leaving. However the next morning, we awoke to a very charming neighborhood with wonderful cafes, restaurants and shops. In the end this didn't ruin our stay, however, it would have been helpful to be warned about this.

One more point that wasn't mentioned in any previous reviews that was disappointing was the scuffed up walls. This is not evident in the photos, however, there are several nicks and scuffs on the walls that affect the ambiance of the room, and I believe it worth mentioning,

The location of the apartment is very convenient. We were able to walk to all the major sights on the other side of the Golden Horn. It's also right next to Istiklal street, which is great for nightlife.

All in all, I would recommend this apartment, it's charming and cozy, very close to all the sights, and in an awesome neighborhood.