Clean room. Check.
Comfortable bed. Check.
Sound proof room. Check.
These are the things I look for in a hotel and the Cosmopolitan passed all three. We stayed only 1 night as we just wanted to get away. The place has a sophisticated look with all the electronic upgrades. The place lacks some of the features of the other high end hotels like a grand entrance or a huge gaming area but certainly doesn't need it. The place doesn't even smell like smoke and neither did my clothes.
The staff here are very friendly from the valet to the room cleaning staff. They provide slippers in your room which is a nice amenity. The bathroom is odd in that the shower has a window to the bedroom, not the first time I've been in a hotel with this feature but is it really necessary?!