Just got back from taking my wife for a birthday weekend in Vegas at the Bellagio and it was wonderful.
The concierge is an amenity you should utilize before you even arrive. I was able to have a limo arranged for pickup at the airport, and make dinner reservations at Le Cirque within 30 mintues of booking. I then went on to have the concierge arrange for things like a Chocolate swan and berry fondu to be deliverd 30 minutes after check-in, as well as flower petals and chocolate covered strawberries placed in the room when we got back from dinner another night. She was able to get tickets to the expressionist gallery if we wanted them, she arranged a free gift parfume set because it was my wife's birthday. Everything was excellent and on time.
The room was bigger than expected and while it didn't overlook the fountain, it was directly over the pool and gardens which was nice as well. It had an oversized shower, big tub (no whirlpool), motorized drape, excellent armoir and a stylish (but comfortable bed)
The buffet and the cafe Bellagio looked nice but were very busy everytime we wanted to go so we opted for room service for several meals and it was awesome. Even better, room rates in December were great, it wasn't packed, and while just off the casino, the rooms had a nice seperated feel to them. Luggage ticket service at check-in was awesome as well.
Small nag points:
1. The limo we arranged to pick us up came complete with full ash trays and a nice smell of smoke. Not so cool for $60 an hour.
2. If you don't want maid service, use the privacy notice; otherwise you get relentless maids banging on your door twice daily, and then just walking in.
3. The one bad thing about our concierege is that the dinner reservations she made for us 30 days in advance apparently didn't show up at Le Cirque. I did receive a confirmation in the email, but they didn't have it a the restaurant when we arrived. They were polite about it, and worked us in after about 20 min. That threw off the car ride pickup, and caused us to nearly sprint in formal wear to the MGM Grande for our KA show. So that kinda sucked.
4. The business center closes at 8PM, they charge $11/day for high speed internet with no wireless in room, VPN traffic was blocked, and the concierge station closes at 8PM as well. This was especially annoying when we needed to arrange another car and no one could help us. For business travellers I think more could have been done.
The Bellagio is the nicest place to stay in Vegas because there's no schtick. So much in Vegas needs a theme or a reference point that is reiterated in every aspect of the hotel. It just 'is' everything you think of when you want the best in Vegas, and it does it a subtle manner.