MARGHE is one of my go-to pizzerias, and for me, it's one of the best in Milan. They make a traditional Neapolitan pizza and aside from the classics, like Margherita and Marinara, they have an interesting selection of pizzas, that often change.
The location is quite small, so a reservation is recommended, especially on a weekend. But walk-ins are welcome, so it's definitely worth a try. If you are in Milan just for 1/2 days, this is a spot I'd definitely recommend.
The area it is located in is not touristy, and it has a more local vibe.
I tried most pizzerias in Milan, as I often go with my friends, and this is among the ones we went back to many times.