Visit the Just Landed website. Scroll down the page and click on the "Italy" icon (there is a picture of the country next to it). There will be a list of information about moving to Italy. Scroll down to "Housing & Rentals," and click on it.
Scroll down the page until you see "For Rent: Rooms in Shared Flats," and click on it. You will see a list of shared flat listings. At the top of the page there will be a button marked "All Regions." Click on it and select Milan.
Choose "Looking for a Shared Flat" in the "Wanted" category at the top of the page. A list of ads made by people looking for a roommate will pop up. To the left you can type in keywords to refine your search. If you are looking for a room (and not just a roommate), proceed to step four.
Choose "Rooms in Shared Flats" in the "For Rent" category and you will see a list of people advertising rooms. You can also find a roommate this way. At the left of the screen, put in keywords or a rental price you are willing to pay and the time period you are looking for a room to further refine your search. To place your own ad, proceed to step five.
Click on "Post a Free Ad" at the top of the page under the "Housing" tab. Answer the questions and allow the site to guide you through the process of posting an ad to find your roommate.