While Kadikoy does not have any of the major tourist attractions in Istanbul, it is a very pleasant, typical Turkish suburb--without the steep hills of the European side. All the shops, cafes, restaurants, that you could want and only a pleasant 20-30 minute boat ride to the European side.
Sevican's apartment is great! The rooms are larger than the pictures show. Comfortable chairs and sofa in the living area and a well equipped kitchen, with a large fridge and freezer. There are only two stools at the dining counter, which could be a problem if there are more than 2 guests. The bed is comfortable with plenty of closet space. The shower is large with plenty of hot water and there is also lots of storage space in the bathroom, which is not always the case in some apartments.
The apartment is on a quiet street right off busy shopping areas. I think this is a great find and I highly recommend it.