We measure our Airbnb stays with a simple question: "Would we stay there again?" I'm not sure we can answer "yes" for Stefano's place.
First things first: the apartment was totally satisfactory, and there was nothing wrong with it. The location could not possibly be better; it's a block away from both Piazza della Repubblica and the Duomo. It's generally comfortable and as it appears in the photos.
The apartment was just more "bare bones" than we've come to expect with Airbnb places (including the other two places we stayed at on this Italy trip). Some basic necessities were either missing or in short supply, such as toilet paper, paper towels, soap (shower and laundry) and coffee filters (for provided coffee maker). The overall amenities provided (kitchenware, furniture, etc.) were all about the minimum necessary, no real extra touches.
Stefano's communication was excellent, however, and he responded very quickly with the missing items and any questions we had. And it was very easy to locate the apartment and get in with the door code and instructions provided. There is a lift to get to the second floor. There's also a supermarket just around the corner.