I am writing this four days after we left the apartment because I wanted to ensure that I was thinking about our experience before writing this review.
The positives: The location was fantastic! (but there are quite a few to choose from on AirBnB that are in the same area).
The negatives: Aside from apartment not being as clean as it could/should have been (no toilet paper, used bottle of water in refrigerator, used coffee pod in coffee machine and dust all over the floor) and having to make an extra effort to get the keys, our primary criticism is about the host. It just seemed like he did not and would not (even after we made our displeasure known) make himself available to ensure that we were satisfied. The word is "host" and he didn't even come close - leaving the keys to be picked up at an office staffed by a very nice girl that was totally unable to help meet our needs. He wasn't even available by phone. We stayed in two separate apartments in Milan (beginning of trip and end of trip), one in Naples and one in Turin. In all cases, the host met us at the apartment, ensured our check-in and how to use the utilities, etc. Luca really seemed like he could/would not be bothered. When I messaged him about how to turn the heat on in the apartment (because the thermostat shown on his instruction sheet was different than the one on the wall and we wanted to make sure we didn't upset anything), his response was "just turn the knob". I replied that "if it was that easy, I would not have bothered him". That pretty much summarizes our experience.