In brief, I do recommend Umberto's property to other guests.
What I loved is the location, easy to access, easy to find parking. There is a dedicated elevator to reach the 4th floor where the apartment is. At first, we were afraid of noise since we saw huge crowds in the area, typical of the San Lorenzo neighborhood, it seems. But the apartment is high up and soundproof enough for noise not to be an issue.
I liked the apartment very much, the bedrooms are quite spacious and the beds are comfortable. The bathroom is quite small, but it is OK.
I also liked the check-in; we didn't meet Umberto personally and I it seems this is a company that owns several properties. Never mind, the staff was very responsive, kind and efficient.
The only suggestion for improvement I have is to do an extra round of cleaning in the bathroom and fridge. Don't get me wrong, they were clean, it is just that sometimes you need some extra steps to remove some food or other unpleasant odors.