Milan is the fashion capital of the world. Everyone should visit Milan at least once in their lifetime because you will never look at any other city the same way after you have visited Milan.
Milan, with respect to all the other Italian cities, is super diverse. 20 percent of all permanent residents of Milan are not even Italian. Milan is known as one of the most gay-friendly cities in Italy. The nightlife in Milan is amazing and the more you travel the more you will realize this. In Milan, you have a super high standard of living in quite a low price.
Milan has literally everything that Italy has to offer. One thing to remember, when in Italy is that locals drink their coffee standing up by the bar. If you are outside, that's a clear sign you are a tourist and be prepared to pay extra.