We stayed in Milan in late November as a family of four (2 adults and 2 teenagers) The location of this unit was fantastic and walkable to the Duomo and metro stops. Safety and security in the building was top-notch; a key was required to enter the main lobby areas in the evening and there was a doorman during daylight hours we noticed. There is also a small grocery store right next to the building but options are very limited.
The photos of the unit are not accurate and make it appear much larger than it actually is. The furniture and fixtures are not maintained well and would suggest the owner update as they appear in disrepair. While there is a kitchen, don't expect to have coffee or any amenities left for you. We didn't end up using at all.
I'd also suggest having two luggage racks in the apartment for unpacking/packing, slippers for guests, better hangers for clothes, and a few more touches to justify the price vs a hotel. Would not stay here again.