Four stars.
The food is decently priced and the arugula salad that came with tuna melt sandwich was pretty fresh. There are indoor as well as outer sittings overlooking the beautiful museum atrium. With a good amount of sunlight floating in, having lunch over a glass of wine makes you feel like you are on a vacation. The dessert pastries looked pretty decadent with very reasonable prices ($2-$3). I know I will be paying the double amount back in NYC. The museum is free entrance (!). I would definitely come back for lunch if I worked in the area. Pretty good overall; pretty great for museum food.