My goto spot to stay when in Vegas. While it is certainly not a fancy place the staff are always VERY friendly, it has a great location on the strip, it is clean, has 2 starbucks and I nice little poker room with some cheap daily tournaments.
On the downside the sportsbook is not great but other than that if you're going to Vegas and want to put your money into entertainment as opposed to the place that you basically only see for the 30 minutes when you get up and 30 minutes before bed then the Monte Carlo is ideal. Was just there in May and Nov and booked today to go back in Feb.