If you're looking for a nice place to stay in Milan, I strongly suggest you to stay at Paola's place. It is nice and clean, close to the canal where there plenty of bars and restaurants and if you wish to visit the Duomo, you have the tram that is at 5min away by walk.
Tip: go to the café/library Gogol for an amazing coffee & literature moment (1min away by walk from Paola's apartment).