I would recommend to stay at this place.
It is clean and comfortable two level apartment. It has 4 separate bedrooms, spacious living room and dining room. Also there is a great balcony which is perfect for chilling out, and it has a beautiful sea view.
The location is great, you can take a ferry to the european coast or a bus to subway station, mall and Kadikoy area. There are a lot of nice cafes and restaurants around.
To conclude, it is the great and comfortable place to stay if you travel in a big company (4 and more)