I stayed in Nicola's apartment for six weeks, and I recommend his place for three main reasons. First, when I arrived, the apartment was spotless. Whoever cleans his place before guests arrive does an amazing job. Second, the WiFi is as advertised: very fast and without limits on use. As a researcher/student, I found this to be very helpful. Third, the apartment is in a convenient location. If you appreciate quiet, then you will like the neighborhood. Also, there is a supermarket (PAM), a home goods store, and a pharmacy - all on the same corner - less than five minutes, on foot, to the north. And even though the apartment is a bit removed from the city's main attractions (Duomo, Galleria, Sforza Castle, corso Buenos Ayres, Fashion district, etc.), it is a five-minute walk from the "Bande Nere" stop on the metro red line, which will have you at the Duomo in ten minutes. As an added bonus, Nicola's contact at the apartment complex, Ms. Loredana, is very kind, helpful, and flexible, which made the check-in and check-out processes easier.
I would echo a previous reviewer's comment, however, that the hot water quantity is a bit limited, since it is produced by a small boiler located in the bathroom. Still, this detracted little from the overall quality of my stay, which was indeed quite pleasant.