My cousin and I traveled from the United States to Istanbul for cosmetic procedures. It was important for us to have separate bedrooms, a kitchen, and plenty of space to recover comfortably, so we opted for an airbnb over a hotel and we're so glad we did! Serdar met us in person for check-in and gave us the apartment tour and rundown - very nice guy!
The two gems of this building are the elevator (almost impossible to find in most airbnbs in Istanbul), and the iron door for added security. We felt so incredibly safe, and had peace of mind as two young female foreign travelers. The neighborhood is very walkable to shops and restaurants, and right around the corner from Taskim Square. With it being so central, there is a fair amount of traffic noise on both sides of the apartment, so do be aware of that.
The apartment itself is so wonderfully designed and decorated, and super cozy. The heat worked especially well, which was really important in the cold January temperatures and snowfall. Communication was great - Serdar was available for any questions we had and even came by for a quick fix that was needed in the kitchen. Overall we really enjoyed our 1-week stay, and recommend this awesome space!