We stayed five days in October and had a great time with the family. The apartment is located directly at a small train station and absolutely central, so of course it is not completely quiet. With the bus you can get - without changing - to more distant destinations. Two supermarkets and everything else you need are in the immediate vicinity. In a few minutes you can walk to St. Peter's Square.
The apartment is very clean and tidy, everything is well maintained.
Consuelo's tips for our stay were really extremely helpful.