Leo Greta in Carnegie or Di'anoia's in the Strip are amazing. Leo Greta's a narrow brick room, while Di'anoia's is an open space with two walls of windows, so Leo Greta is more what you want, probably.

For a bit fancier, Dish Osteria in Southside or Bar Marco in the Strip, both of which are small, cozy joints.

I think those are about as good as it gets for Italian, and yeah, they're real real good.