We were 3 friends staying for 4 nights in Marco's cute B&B. The room was kept very clean during our stay, the street was quiet and the only noise was if other guests came or went (however in our case they were all very considerate).
For us, with 3 suitcases, the room felt a little cramped when everyone was getting ready to go out, but we were prepared for that and all in all it was a good room.
Breakfast was served by Marco (or one of his friends) every morning and gave time both to chat to him and other guests staying - very nice!
Marco also helped with advise on restaurants, local transport and transfer to the airport, all which was much appreciated by us.
The Monti area is very nice, with enough restaurants and bars for those evenings when you don't want to go trekking to another part of the city. We walked everywere basically, but also tried the taxi app mytaxi on NYE, which worked out great.
Exceptional value for money if you like a social breakfast and don't mind a 10-15 minute walk to get to several of Rome's must-see's.