Bostanci Hotel is a big Hotel (11 floors), rooms are on average 25mq and emplyees are always nice and helpfull. But i had a dinner at the hotel restaurant and the service was really slow 2 hours to eat a couple of things. I don't think it's a bad hotel, but i think it could be better improving breakfast with sweet food (brioches and pastry) since it was mainly savory and the staff at the hotel restaurant.
Hotel was reasonably priced with breakfast included. Room was fine. Staff at times seem bored and could be a bit more friendlier. Ate out most nights in Baghdad caddesi which is about a 15 min walk away. Bostanci is a fairly quiet area. If you want a more livelier area try Kadacoy.