I ate here twice while visiting family and friends in Philadelphia in October. Consider me a huge fan!
The first time, it was just a friend and me, and we had the following:
Pizza margherita (tomato, basil, and mozzarella)
Although this was simple, it allowed us to get a feel for the pizza crust. It was thin and perfectly charred. The tomato sauce had just the right amount of tang and the mozzarella was very good.
Vegetable antipasto for one (shared)
This was good but not amazing. Perhaps as a California resident, I am not as impressed by this sort of a dish because of how well this is done out here. Not bad, but I would not get this again given the other offerings.
Pastas came next. I am a total pasta freak (hence why I so love Angelini Osteria and Osteria Mozza in L.A., and Lupa in NYC-- still have not been to Babbo!). Overall, I think Osteria's strength is its pizzas, not its pastas, but these were still pretty damn good.
Robiola francobolli with chanterelle mushrooms and thyme
The pasta was perfectly delicate, but I would rather have meat than robiola cheese inside, simply because it was a little too rich with that cheese in there. Still, if you didn't eat too much of it, it was delicious.
Lobster pasta (special)
I really think they ought to stop making this. It is really bad. The lobster is ok, but the sauce is kind of awful. Some one remarked to me that it tastes like Chef Boyardee and I sadly have to agree. I just picked at the lobster and skipped the spaghetti. With all the beauties on the menu, avoid this like the plague. And please, Powers that Be, stop serving this!
Dessert - polenta budino with gianduia(no picture)
The budino was silky smooth, but the gianduia was too light a pairing with the already light polenta pudding. It seemed to need something rich with it.
A word re the service. Our server was kind of weird on my first visit. Hard to describe, but my friend and I both commented on it.
The second time though, I was with my family and the five of us tried a bunch of different things. We had a great server, way better than my dinner the night before. I made sure to tell the manager how great she was.
"Ricciola crudo" (marinated yellowtail with lime, chive oil and watermelon radish)
Fresh fish in a simple presentation. I only got one piece because we all shared--wish I could have eaten more. It melted in your mouth.
Wood grilled octopus, cured lemon, potato, and chives
This was very tasty. However, I have gotten to eat Osteria Mozza's version in L.A. several times this year, and the octopus itself is just much larger there, which I prefer. That being said, the octopus was cooked nicely and I liked the simple preparation. A definite thumbs up.
Side dishes- we tried the beets.

I am biased in this category b/c no only does my husband make a kick-ass beet salad with beets we get at our local farmer's market, most every restaurant in CA now serves a beet salad. They are a bit played out for me. However, these were prepared a little differently than most, and were perfectly fresh. Very good.
Pizza - Again, definitely the star of the show.
Pizza Lombarda
This pizza comes with baked egg, bitto cheese, mozzarella, and cotechino sausage. The sausage in particular is outstanding, and I think a few more pieces would serve the pizza well. However, as is it was pretty damn good. I was sad to have to share it, and of all the dishes, what I am most looking forward to eating when I next go to Osteria.
Pastas - we had two that night.
Lamb caramelli
This pasta was described to me as a tootsie roll shape, and you can see that is an apt description. While the pasta and the lamb inside were tasty, I found the sauce a bit too oily. Not my favorite.
Pork ravioli

This was sort of a delicious deconstructed ravioli. The pasta was silky smooth. I think Osteria just has a way with pork given how amazing the sausage on the pizza was. Definitely order this - best pasta by far of the 4 I sampled.
I also tasted my sister's wild black bass (she does not eat meat and thus had to abstain from most of the sharing). The fish was really tremendous.
Finally, we finished with the nutella pizza. Even with 5 of us, it was much too large--I could not even eat my entire piece. That being said, it was great, though I thought it needed some ice cream so ordered a scoop on the side. The kitchen kindly accommodated.
All in all, not only is the food great, but the convivial atmosphere is perfectly suited to the restaurant's name. Definitely the best Italian food I have had in Philly (note I have not been to Vetri yet), and the type of restaurant I think the city was longing for. I hope to visit when the weather is warm because the outside patio looked great.