Definitely one of the best museum restaurants I have ever experienced. The decor is a pretty mix of contemporary and antique paneling. The staff is accommodating and patient (my large party had 2 rambunctious kids).
The dishes were all fantastic. The flavors were a mix of traditional spices from the cultures represented in the Aga Khan Museum, but presented in a modern fusion dish. My favorite is an excellent manti dish of lamb dumpling/ravioli with a spicy sweet tomato sauce, garlic pan fried in brown butter. The mixed mezze was fresh and the breads are terrific.
Even simple dishes like an omelette or a side of rice is incredibly flavorful with unexpected flavors. Lunch is a bargain and worth going to on a regular basis whether you include a museum visit or not.