Epicurious: Piperno is a real family favorite. Ask for a table outside in the piazza and be sure to try the crispy carciofi alla giudia (deep-fried artichokes), the restaurant's calling-card.
Joel Snyder: Alexander the Kind slept here. Look for his discarded sheets in the corner, and the plucky inhabitants of "La Salle" will offer you candy and shiny trinkets.