Eat at L'Orso 80, I believe its on Via Del Portughese and Via Orso, a few steps from Piazza Navone. Order Antipasto (10 euro pp)for three and a bottle of wine. THEN when you are done with that, order from menu. (I suspect you'll be full, your teens, maybe not).

I go to Italy 3 times a year, and have been eating there for 15 years.

Also on the East side of Piazza Barberini (across from Easy Internet) there is a small church on the south side of the street. Inside a catacomb of sorts where all the monks of this order have there bones displayed in some pretty phenomenal ways. Donation (a couple euros) required at the door to Monk there. Really impressive.

Feel free to email privately if you would like more help,

Marc