I'm not Italian but if you were and went to Pronto you would feel at home. As far as regional oreintation its is a mix.
I had the Vongole (tomato) with choice of tomato or garlic lemon parsley sauce. had at least 20 med size clams, generous serving, sauce was well rounded in flavors of clam tomatoe olive oil garlic and small sprinkle of flaked red pepper for ocasional heat, pasta cooked to finnish that slightly thickened the sauce.
others had a: fettuchine alfredo with chicken white breast meat, bits of sundried tomato(not much just a few in small shreads. not overdone with quantity of ingredients, very well balanced cooking.
clams and mussels completly covered the large plate of pasta, garlic lemon parsley style.
grilled chicken breast. Was skinless and pounded flat, cooked grill marks, garnished with diced tomatoes dressed with olive oil and herbs, fresh steamed veggies. Looked moist.
I started with soup pasta fagoli, man what a good cook this guy is! Soup had that thickened texture from beans but not so thick you didn't notice the stock it was made from, not runny, not real thick. pieces of ham, beans, pasta rings, a taste of fennel just once in a while, bits of tomato, This guy can cook! waiter offered fresh grated parm and pepper.
When we asked the waiter what was on the salumi app, the chef /owner comes out and wants to see who would ask about it and offers nuggets of aged reggiano of excellent quailty, smiling the whole time.
Though its not oliveto its not oliveto prices and its a very fair price considering the quanity and more important quality.
I've had on previous visit, very fresh calamari as an app (fried)& entree fresh calamari w heirloom tomato sc. for all the italian places in Marin this gets my vote for the best in Marin for Pasta!