The place is great. It's located a pleasant walk away from the ferry, the best way travel across Istanbul. It's also very close to the market, shops, bars and restaurants in Moda/Kadikoy.
The apartment itself is great. It is incredibly elegant and comfortable at the same time. The kitchen in well quipped, the living room encourages for rest in the evening, and both bedrooms face the inner backyard, so you won't hear any cars at night. I stayed there with my mum for over a week and were incredibly happy.