Marco's place is close to the train station which will take you to Duomo under 10 mins. He's a very friendly host who personally runs through what you need to know around the house and introduces Milan to you in great detail. He seems to know a lot about art so you could ask him a lot of questions! The apartment is spacious and has everything you'd need. I particularly appreciated his high-functioning washer which is a blessing for people who are traveling in Italy for over a week. Great place to stop by!