Fifteen is a great restaurant owned by the famous Jamie Oliver. It has a lovely ambience and an awesome view from the terrace, because its location. Its near the "Bimhuis", a great new age concept building.
Food is great and can be a little expensive but nothing out of common sense. "the risotto" is pretty good and fish also great. All made using olve oil not butter.
You will enjoy your dinner or lunch there.
I highly recommend this place to any traveler visiting Amsterdam.