We've just got back from Kos and went to Scala most nights for dinner, it's one of the nicest resturants in Kardamena. The food was excellent, i'd pay for a flight back just to have the garlic chicken again! The sevice was excellent as well and arrived quickly and the staff were really nice too. If you sit upstairs on the roof top then you get a lovely view while you eat too! Also they do a great breakfast.
We had breakfast here most days and everything we ate was really nice. The waiters were really friendly and always had a chat with you and they also let us use their sunbeds for free. A great way to start the day.