The apartment is perfect for a couple of days in Istanbul. It is small, but very cozy.
Yusuf made sure our stay was perfect: we had an issue with the air conditioning the first night and by the time we got back to the room the next day everything was fixed!
The apartment is close to the main tourist attractions, so it was perfect for us as we didn't have much time to spend in the city. Nevertheless there are many other parts of the city one should explore, which is easy since public transportation is nearby. :)