Their neopolitan style pizzas will blow your mind. They are by far the best you'll find in the greater Pittsburgh area. Other things I've tried here include the mussels, the lasagna (a serious choice for meat-lovers... comes with both sausage AND meatballs), and the tiramisu. All were delicious. I have yet to try something bad here!
The best place to dine, in my opinion, is the back patio...if you can get a seat there and the weather permits. It is gorgeous and peaceful and has a very European feel about it. A bonus for dog-lovers is that they will let you have your pup back there with you (leashed and on good behavior). One of the few back patios in Pittsburgh that will allow it! Not only that, but the staff LOVES dogs and will provide doggie water and petting ;)
The wine bar is also very cute. It is a bit dark for dining, but it's super cozy and a great place to hang out and drink. On busy nights, you will have an easier time getting a table here than in the main room or patio. They have a huge selection of italian wines and a wide range of prices to suit any budget. Service has never been short of satisfactory here in my experience, even on busy nights.