We had a pleasant time at Fabrizio's place. The apartment is basic but comfortable, and the location is excellent - it is well connected and central but also feels perfectly safe, even in the evening. It is kind of noisy, both due to street noise, and also due to the fact that the wall dividing the two guest rooms is super thin. The one thing which truly bothered me was that the wifi connection is poor (I ran up a data bill due to the number of times that my phone automatically reverted to 4G).
Although his brother Sergio, who checked us in, did not make a very good impression with his abrupt manner and his lateness when he came to give us our luggage back before we caught our train, Fabrizio was very good at communication prior to arrival and during our stay. He was also quite accommodating in that he offered to keep our luggage on the last day.