This is the only hotel I stay at in Vegas.
The service is always top notch and I always get an upgrade every time i've stayed there. They also don't spare any expense for decor and ambiance... very chic and hip hotel. What I like most about it is it attracts a younger crowd than you'd see in other vegas hotels (like Bellagio next door).
Ask for an upgrade to a high floor room facing the bellagio fountains, best view in vegas!