Book & Stage is a small bar near the lobby of the Cosmopolitan. After spending 3 nights at the hotel and hitting the bar a couple times, it was a-ok as a hotel bar, but there wasn't any live performances in the evenings, the book portion is small, and there are better bars at the Cosmopolitan.
The bartenders are nice and all ... like most drink slingers in Las Vegas. No complaints about the service; however, both visits we left and headed elsewhere cause the place was practically empty. When there aren't any live performances on the small stage, then perhaps the niche Book and Stage fills in as a quieter bar choice than other Cosmopolitan hot spots.