50 Kalo di Ciro Salvo Pizzeria London serves Neapolitan wood-fired pizza across the diagonal from Trafalgar Square. The menu centers on Margherita and Neapolitan pizzas with thin, chewy dough, and the usual order is one pizza per person. The room is busy and not quiet, but tables turn quickly. Without a reservation, you either wait a long time or leave with no table.