Milan is wonderful. City centre has loads to offer. Duomo area has loads of shops and of course the Cathederal which is well worth a visit. "Brera" area has fab restaurants and bars. The closest metrostation is Lanza, green line. From there it's a 5 minutes walk to Brera. You can also go, 10-15 minutes, from the Duomo. of course you can also vist San Siro, home of AC Milan's football ground. Check out this link.