Nice stay but regarding privacy, there is a common passage inside the apartment so Cristina and her family members can access a room inside the apartment. It’s written on the apartment’s description and it was not a problem for me but have it in mind if that’s an issue. The bed is a sofa-bed with a thin mattress.
About the location, bus 42 is close by that goes to Milano Centrale where there are trains and metro. Walking to the duomo area takes around 1 hour. Be aware of heavy luggage as the elevator doesn’t go to the apartment’s floor.
Finally the check-out is at 10am but as there were no guests checking-in, Cristina was very kind to let me check-out later! Her apartment is right next door which makes it easy to be in close touch.