We went to Aria one night for a late night dinner, we assumed the cafe was the only restaurant open. We sat for 15 min. before anyone acknowledged us. It was after 11:30pm and the restaurant was close to empty, unacceptable at a such an upscale cafe. The prices are ridiculous for the simplest "cafe" items.
We asked the server if the other restaurants were open and he said he didn't know, after another 5 min waiting for him to find out we left and said we would find out on our own.
We went to Lemongrass instead which had GREAT food and EXCELLENT service.