Aria is as good as it gets!
The entire property is stunning. So different from anything else you will find on the Strip.
The rooms are very luxurious. Best hotel bed that I have ever slept on! Nicely decorated. Spa like bathroom with a soaking tub. The remote system for the room was easy to use and was pretty darn cool. I read several people's complaints about the system not working, and we did not have those issues.
Customer service was wonderful. Front desk, housekeeping, security and the employees in various shops were all warm and welcoming. Check in was quick and our room was ready right away, we even had a great view of the Strip!
The casino is dark, but we liked it. It also smells great in there, and is probably the least smoky casino in Vegas.. Big plus!
While we did not shop in Crystals (the mall connected to Aria), it was fun to walk through. City Center is a refreshing change on the Vegas Strip. Even if you chose to stay elsewhere (we never would!) you have to spend some time there admiring all of the design and the buildings. Very cool place!