Location, location, location. Giovanna's place is the best option to expend your time in Milan, everything you need is walking distance (grocery stores, local shops, metro station, bus stops, pharmacies, gifs shops, etc.) and if you really want to enjoy the city landscape you also can walk to the Duomo (like 25 min) and just enjoy Milan.
The place itself is super clean, accurate to the photos and description. Giovanna responds quickly to any questions you have. You're definitely going to have a good time in this place.