Stayed with a group of 9 friend in the MoMa hostel. (MoMa = Meeting others, meeting Are). We had the whole building for ourselves, which was great. We really liked the apartment. Location was good: close the Vatican and 15 minutes by foot from the Centro Storico. Supermarket 50 meters down the street and a great little bakery across the street, selling amazing pizza. We also took the e-steps, which are available everywhere, so distances are very doable.
The apartment has a large (shared) kitchen, a seating area and large private terrace outside offering room for about 20 people. Rooms, beds and bathrooms were fine with an airco in each room.
We really liked the art inside the apartment, this was a very nice extra!
Hosts were quick, accurate and friendly and helpful.
So all in all: very happy with the MoMa apartment. Can definitely recommend, especially for groups and families.