The house is pretty easy to find (only a few minutes from Ple Roma) and the 24 hour check-in worked perfectly, we found our room in the 2nd flood. It is very nice decorated and clean. We met Antonella on the first morning, but technically you could have your trip without even meeting her (i highly recomment to not do so) and it was no problem sharing the bathroom with the other guests, we actually never seen them, which gives this B'n'B a very private atmosphere.
The location is brilliant, you need about 5min to the next Vaporetti Station and the Super Market, around this place are some little restaurants, which are pretty low priced, I guess because you are in the student's district.
Breakfest was nice, there were fresh fruits and croissants everyday.