I stayed here over the weekend for the NCAA Championships. The place is like a month old. The room I had was the City View Room with a king bed. It was a super nice pad for 200 USD a night and the shower was awesome! The City Center is a very large mall with tons of shops that are sort of cool, but also totally useless. The Aria is very spacious with a huge pool! My room was quiet and that to me is the most important. After catching up with old friends, a ton of alcohol consumption, sleep is key.
The only issue I have with the Aria is the actual location. Its cool how you can take the tram to Bellagio and then walk to Caesars Palace, but I'm talking about the other way. Its very sketchy over by the Harley Davidson Casino and some crappy Palm Hotel behind it. Watch which way you turn when you leave the Aria, you may end up in crack land.