Just to report back: Fancy hotel, of course (as every one of the large Las Vegas resorts I guess), but the room was only average. 15th floor, two queen beds. Unfortunately they were rebuilding the back entrance (where the taxi queue and valet parking is located), and a 5-story parking right below our room. This would have been acceptable had they not started working with pneumatic hammers at 7am. The windows did not let too much sound through, but it was more than noticeable. We were probably still lucky since getting a room to the Northern Side would have meant building noise of the mega project CityCenter, which is located in between the Monte Carlo and the Bellagio. Facing the strip would have been the best choice (if we had any). Value was not great either since I checked a month before departing that we could have gotten a lower price by just booking with the Monte Carlo directly (for one night a lot lower, the other night slightly higher). With its 4* rating, the Monte Carlo was definitely overrated compared to the Lodge at Sonoma, which had a 3.5* rating. So, for the future, do not bid too early in Las Vegas, check the hotel websites, and consider 5*.