Antica Pizzeria Leone is an Italian restaurant located in the Buonarroti area in Milan.
It's one of the best pizzerias in Milan and it offers all the classic as well some interesting alternatives, which often change.
The area is a bit out of hand and it's in a residential area, not far from city life. Though it's easily reachable with the underground (M1 - red line).
As in all the places in Milan during the weekend, I'd recommend to book in advance.