We stayed at Monte Carlo last month and loved it. It's a little smaller than a lot of places so it's very easy to navigate. We had excellent drink service in the casino our whole stay. The 24 food court served us well on late nights. The Pub was good and their happy hour specials were perfect.
We got a day bed at the pool for one of our days. It was $200 (weekday) for the whole day, but that $200 was a food and beverage credit that could be spent at the pool. If you plan to eat / drink while you're there it's an excellent value. The pool service was outstanding and we got two tubes (included) for the lazy river. They kept us stocked with fresh towels and cold water.
During the evenings, the Ignite casino bar has a dj and they play great music. There's a CVS next door to fill up on refreshments for your room. Easy access to NYNY and MGM both, even though there's outside construction going on. It didn't effect us whatsoever.
Enjoy your stay!
Edited: 23 August 2013, 15:50