Stayed there for my 21st bday sat-mon. The hotel is very nice. Like very nice. Their standard room is probably a high level room at any other hotel. The staff go out of their way for you and are super friendly; our room had a view of the freeway (eww) so my bf called the front desk and asked if we could get a better view and we were upgraded (for free) to pool view room on the 42nd floor and that room was bigger than our original.
For some people it might be a negative but I really enjoyed the no casino aspect of vdara. Its soo nice to just walk right up to the elevators and to your room instead of wandering through an endless sea of machines and rude drunk people to find your room tower/elevator like at other hotels.
But the reason I'm giving only 3 stars is because the Vdara's location SUCKS! Big time! Its such a hassle getting to it! And since its situated behind Aria its a real pain in the ass to even walk onto the strip. Which is something I did not need coming back from the club in heels at 3AM.