Le Cirque is a modern American dining experience in the Bellagio that fits the bill in terms of the decor/service but the taste itself is a bit more tougher to distinguish.
To find Le Cirque, first, go towards the back of Bellagio when entering from the main entrance past many of the restaurants. Signs will start appearing about halfway in.
The decor of Le Cirque is intimate and cozy. Not a big fan of the old circus paintings and the colors personally but you do get a nice view of the Bellagio fountains from here.
Service here is outstanding all-around. Great stories from the waiters; explanations of all the dishes; constant checks of water to supplies. No problems.
The menu is a prix-fixe menu of different sorts (most of them are +$100). A few of the options also have extra costs affixed. The one I chose was with an appetizer/entree/dessert. They also have a cocktail menu (and wine/beer) ranging from $16+. For the cocktail, I received the deja vu which is gin with cucumber flavors - pretty good and love the presentation/cocktail shaker. You also get bread (lots of flavors) and salted/unsalted butter. We also got a seafood amuse-bouche which was pretty interesting and even had some gold on it.
For the appetizer, I got the risotto which came with lobster. It was pretty good although the texture was a little strange with the nuts and fruit-like food involved. I then got the sea bass which came in an egg roll shape. I thought the presentation was interesting but the taste was fairly not that special here with the salty/vinegar-y sauce and the egg roll style dominating the flavors too much. Finally, I got the pistachio dessert - the bar which wasn't too shabby with good flavor profiles. The included buttermilk ice cream though was tasteless in my experience. We also got some small desserts for free but I was told the flavors weren't that special here. Most of these dishes had that similar deconstructed feel as well which all looked interesting/cool but the flavors always were a bit all over the [lace.
Le Cirque isn't bad by any means in terms of the quality of service or experience. Just the food I felt wasn't completely connecting taste-wise with the creativity behind the dishes.