Considering that this apartment is only a few minutes' walk away from the central station, it is very quiet at night and we didn't hear any noise from outside, even with the window open. The apartment block felt safe and secure. We were on the 4th floor (there are lifts).
There are several small supermarkets nearby. It is very easy to use public transport to reach the centre of the city, and you can be at the Duomo, via the metro, within about 20 minutes of leaving the apartment.
The kitchen is of good quality and well equipped, and the living area is spacious. The bathroom is stylish and warm, with a good shower. The WiFi worked well too. If you are wanting to sleep in the living area on the sofa bed, bear in mind that (at the time of writing) there is no shutter on the living room window so there is only a thin blind to keep out the light. Cleanliness was of a high standard.
We found the main bed a little firm, but still slept well.
Diana from "Welcome to Milan" was in contact several days before our stay to check our preferences for bedlinen and to confirm check-in arrangements. She handled check-in efficiently and dealt promptly with one small request we had after she had gone.
We would certainly consider staying here again. Recommended!