Milan is a beautiful city dripping with culture. If you are interested in architecture then this should be a stop. I am here for the Expo and have been very pleased with how well the city is handling transportation. The city is very walkable and clean and even when it is raining it is worth going out to see.
Insider Tip:Stay at hostels/ hotels near the center. They are a bit kite expensive but when the city shuts down early you don't have to worry about trains or overpriced late night taxis. I literally wandered fit hours and when I was done and exhausted I was able to get back to my hostel quickly