We ate at Bilacus on the recommendation of a relative and it was indeed a good recommendation. True, in Bellagio there are few truly 'bad' restaurants, but I think Bilacus is just a bit better. My dining companion had the panzarotti which she deemed delicious and I had the meat ravioli with mushrooms, equally delicious. We shared a single second course, it was lake fish sauteed in butter and seasoned with sage, so good.
The outdoor seating was pleasant with a delicate breeze at our back and the view down the street, twisting downhill out of view. The day was warm, mid eighties (28 for you locals) but it was cool on the restaurant's terrace.
The service was very good, each of them with a good command of English. Did I mention the prices for an upscale neighborhood were very reasonable? True! But it is the food that makes the restaurant, and they certainly delivered.