I really see nothing so wrong with Monte Carlo. It is in the middle of new Las Vegas, near City Center/ Vdara/ Cosmo/Aria. So you're in PRIME location of vegas, without that PRIME location price.
Didn't have any issues with my room, all the concierge/room service people were very friendly!
The only issue we had was that when our room wasn't ready, they told us to give them our number and they would text us when our room is ready. We got that text TWICE for two different room numbers, and we got that second text once we already dropped our stuff off at the first room , went to a pool party ... etc. So we were a little stressed about our keys not working later, people walking into our room with our stuff. that didn't happen, but still whats up with that text?!