The apartment is perfectly situated: 3 minute walk from Loreto metro station (a cross between 2 lines, one goes to Central railway station, the other to Duomo), almost on Corso Buenos Aires (the main not-so-drastically-expensive shopping street). There is a supermarket and a few caffes nextdoor, recommend by Sonia.
Sonia herself is very hospitable, she answered every our question, showed us every detail of her well equipped apartment, and left some tea and coffee for us.
The apartment is cozy, well suited for 3 people (I guess, since there were only 2 of us and plenty of space left). Our favorite place was the balcony with a view of a local closed garden. We came in early spring, but I think that from May onwards the garden will be thriving, and breakfast on the balcony will become the very image of Heavens.