The staff were very nice and the room was fine for our use. It was a bit smaller than it looks in the photos but that was ok for us. The location is great - quiet and yet very close to the main part of town.
Several reviewers said great things about the breakfast -- and it was one of the reasons we booked this particular location -- but it seemed pretty basic to us. Cakes and cookies were store bought, but the crepes, french toast and jams were nice (but some of the cooked foods were cold even when we came early). The yogurt was home-made and very nice.
View from the veranda is very nice and a great way to start the day.
One thing that almost caused a real difficulty was that when we booked the shuttle back to the airport, the person on duty reserved for us the wrong one -- so it was only at the last minute that the day manager saw the mistake and ordered another taxi - which cost more than than the shared ride would have. So be sure that you confirm with them the proper airport shuttle since there are two international airports for Istanbul!!
Overall though it was a good value and a clean room :-)