The Cosmopolitan is a stylish, modern hotel on The Strip (next to Bellagio and near Caesar's Palace) that attracts a younger and hip crowd. Rooms are clean, but a bit mundane in design for me. A huge plus of our room was the accessible balcony that overlooked the iconic Strip and allowed us to soak up the sun. The hotel is smaller than the surrounding hotels, but has good restaurants, pool area, and nightclub (Marquee).
Bottom line: The Cosmopolitan is the Vegas' version of a swanky boutique hotel on a larger scale, of course.