We had a lovely time staying at Massimos apartment.
Massimo himself was very friendly and showed us around. He explained some things about the area and then left us to it. He speaks great English as well.
The apartment is near a square with lots of places to eat and near two metro stations, which take you to Duomo very quickly. You can also walk to the centre in 40 minutes.
The bed was very comfortable, the kitchen was well equipped and it all felt very authentic, like your Nonna let you stay in her apartment.
It also had a balcony which would be lovely in summer, and some free essentials like salt etc to save you buying them when making meals.
Maybe one suggestion would be a couple more pillows? But this is nitpicking really. We had a great stay and would come back.