Elena and Roberto's apartment was in a great location, in a walking distance to the center (Duomo zone), and if you prefer something quicker, it's also near the metro (which will take you almost anywhere on Milan). The view was simply amazing, at day and at night.
Furthermore, they where both great and kind hosts, providing toiletries if needed and a good breakfast, explaining me how to manage myself in the city and giving their recommendations (when asked) on what should I do.