I booked the 2-for-1 deal with Cosmo a few month ago and we stayed there on Friday and Saturday. We were in the East Tower and had a Terrace Studio room. We had a great view of the strip, Planet Hollywood/Paris direction.
The room was big, you walk in and there is the bathroom, 2 sinks, HUGE walk-in shower and a tub. The next section had an L-shaped couch, desk, table, sink, microwave, mini-fridge (stocked so you can't use it for your own stuff) and TV, then the bedroom section had a king size bed, 2 end tables, the closet and another TV. When we walked in were blown away, it was very stylish and big. But the closer you look at everything the worse it gets. Carpet was coming up in the corners, there was dust on the desk and the worst park was the purple couch had stains on it! We didn't even sit on the couch once. And the curtains were manual, Palazzo, Bellagio, Wynn they all have automatic curtain that you can open and shut with the push a button. Small touch I know, but I feel like Cosmo skimped on that part.
Overall it was a nice stay. The property is amazing, great restaurants and bars. The room itself left me feeling not that great. I don't think we'd stay here again unless I got a really crazy deal and it was cheaper than Palazzo, MGM or Mirage. We will continue to go back for the buffet, Holsteins, The Chandelier Bar, China Poblano, etc., but not for the rooms.