The apartment is magnificent and very cozy. When we arrived host's team met us and showed the apartment. They were very nice and polite. Rooms are spacious with big windows. There were many kitchen utensils and few times we even cooked breakfast there.
We also liked the district where we lived. It was near the city center but It wasn't noisy. There was a pier not far from the apartment and we often went by ferry to other areas of Istanbul. It was also convenient. So it was a good trip and we are glad that we chose this apartment!
As for minuses - there are a lot of windows in the apartment it was quite cold from time to time. But I think it's a common thing for many apts in Istanbul.
Would definitely recommend to stay in!