Aria is definitely a class act and a nice break from the typical Vegas hotel scene.
The hotel is new, super modern, with great ambience. The rooms are not huge, but have great amenities including full A/V system and automatic curtains! My only complaint with the rooms is the lack of counter space in the bathroom.
Aria's location is excellent, next to Crystal shopping and the Cosmopolitan restaurant scene. It also has several top-knotch restaurants of its own such as Masa and Julian Serrano. The casino is expansive and uses the M Life program, though a bit on the smoky side. There are good lounges within the casino area, but the main nightclub is currently closed for renovation.
Check out the 2nd floor for a great, not too crowded Starbucks and good clothing shopping.
I would definitely stay here again!