Nazarena's place is no doubt a good choice to stay. Very good accessibility, 5 min walking from centrale train station, 5-7 min to 3 different line metro stations. I can even get back from San Siro in 1 hour after a big match at night:)
The house is easy to find and the room itself is big, clean, and cosy with own washroom which is very convenient. Nazarena is so nice and we talked a lot about the trip. Recommended if you'd like to stay near centrale.