Overall we really enjoyed our stay at Nori B&B. Especially because of the very friendly staff, walking distances to Termini, Colosseum and other sights and clean facilities. Breakfast is very simple but ok.
Only little critique: Our room wasn't prepared when we arrived (around 11:30). According to the strict house rules (check in time is limited between 10-12 without extra charge), it seems a bit unreasonable that we had to hassle to make it on time but then having to wait after 12. But afterall, it wasn't a big issue.
Just be aware that you have to share a bathroom with up to 6 people and might hear some of the other visitors. But in our case, again, it didn't bother us at all. Thanks again for the friendly hostage!