This place is the best (and everything Borgo Pio once was)!
They only have two tables outside, but the best is to get a plate (their stuff is the finest old-school Italian food) and enjoy a drink at this fine eatery.
They have prodotti tipici from all over Italy.
Just tell the guy what you want and he will make your plate. If you don't speak Italian, just point.
Via delle Fornaci, 46