This is one of favorite Italian restaurants in Vegas. It has an old retro Vegas/Mob fell to it that is kind of tacky but works.
A few housekeeping things about this place ... it's south of the strip, it's pretty much a locals place, it gets crowded (make a reservation) and it's not cheap. You're going to spend a $15 - $30 per person (with drinks). You'll get large portions and good quality Italian food. If that doesn't scare you away keep reading.
I've been here about a dozen time and have always had great service. I've had great experiences in large and small groups, they do a great job in the service area.
It's hard to recommend a single dish here because they have all been so good. I'm going off the beaten path here a bit and say you have to try the garlic knots. Think bread sticks but 100 times better. I'd go back for the knots alone. You're not going to be disappointed with the food, it's pretty damn good!