Aria Hotel & Casino was modern, hip and comfortable. The nightlife was fantastic (both inside and outside) and the service was very good.  The only downfall was the lines at check-in - a bit too long despite the large amount of staff they had working (perhaps this is unavoidable).  Although it was set back a little on the strip, the location was very good and the view from the 23rd floor was fantastic.  I would certainly stay here again!