The building itself is very quiet and clean, centered on an 18th century courtyard that you enter via the large hardwood front door, then a small elevator to the second floor. The apartment had multiple reasonably-sized rooms with 20ft high ceilings, and various loft spaces utilized for clothes-drying and extra sleeping space, accessible via a small spiral staircase. 7 people can be accommodated since it has three queen size beds and also one single bed. The hot water supply is on-demand gas heated, so no anxiety about running out. There are two bathrooms. It would be good if the main bathroom had a holder or bracket for the handheld shower-head, (for those wishing to take a standing shower).
The apartment is convenient for every requirement. Only about 5 mins walk to the metro, 5 mins walk to the Vatican, 8 mins walk to St. Peter Sq, 3 mins walk to two different grocery stores (medium size supermarket), 5 mins walk to a local gym ($10 Euro daily pass), 3 mins walk to a 24hrs bakery with very nice cakes (reasonable price).
Despite the fact the main bedrooms look out onto a busy street from the second floor, the noise is well-cancelled by the double glazed windows when they are closed. We did not see or hear any neighbors during the duration of our stay.
Vittorio (the host) is very attentive, and good-humored. He tried to make sure we live comfortably at his apartment. He immediately brought us some wine glasses, travel adapters, and fixed our internet when I mentioned to him that the apartment does not has any wine glasses and the internet is not working effectively on our first day of stay.