What a great location. I was initially worried that I'd be too far away from all the sites but that was not the case. It's not more than a 15 minute walk to everywhere you'd want to be. If you're familiar with New York, Duomo is like Times Square (with all the street artists, peddlers, tourists, etc.). Brera, where Filippo's apartment is, is like Soho (with interesting boutiques, restaurants and fashionable people). Really fantastic restaurants and cafes across the street. My tour guide also said that she couldn't think of a better area for tourists to stay.
Apart from the location, the unit is accurate to the pictures and description. Strong heater, super clean, very fast internet and easy check-in. In fact, Filippo even let me drop off my bags a little early.
One word of warning for those who are light sleepers... lots of bars nearby and people in the street can get pretty loud at around 3 and 4am on a Friday night. I can sleep through anything and am used to city life so not so much of an issue for me. Also, the next door neighbor has small kids whom you could hear through the walls.
I would definitely stay at Filippo's place the next time I'm in Milan!