Handan is a GREAT host. The apartment itself is fantastic for a stay in Istanbul. The location of the apartment is great in terms of its centrality. All the tourist destinations we visited were within walkable distance (for those who love walking :)).
On the other hand, I had some issues with the neighborhood, which I didn't find comfortable (nothing happened, it's just a personal feeling). There is also loud night noises. Again, the negative things are not within the control of Hanadan, which was a superb host.