Great location in central Milan, very accessible by walking or public transit. Apartment is modern, well appointed, clean, and pleasant. Fridge/freezer, clothes washer, dish washer, stovetop and oven make this apartment a great choice for an extended stay. Windows overlook Via Torino, so expect some ambient noise from the street and trams.
Sweet Inn is a company, not a person, so do not expect to have a personal host as you might have experienced with other AirBNB's. After booking, they require creating a separate account on their website for registration. All communications are outside of the AirBNB app, contrary to my expectations (and AirBNB's policies, as far as I understand).
First accessing the apartment requires unlocking several gates / doors / locks, which must initially be negotiated using a terrible mobile app or web page. A set of keys inside the apartment make this easier for the rest of the stay. There is an elevator, but at least one set of stairs must be climbed.