We stayed for four nights in December 2011, and overall we were very happy with Armonia All'Opera.
The location is perfect. Nearly everything is within walking distance. There are amazing churches and museums within a few minutes walk (don't miss Santa Maria della Vittoria just three blocks up Via Torino), and excellent shopping along Via Nazionale. To the southeast is Santa Maria Maggiore, to the south is the Colosseum, Imperial Forum and Roman Forum, and to the west and northwest is the historic centre. We enjoyed walking up Via delle Quattro Fontane to the Spanish Steps.
The room we stayed in was large and comfortable, with a large bathroom. Everything is well maintained, extremely clean and very professionally run. Anyone who doesn't care for B&Bs because it's too much like staying in a stranger's house will have no trouble here. The feeling is more like a small hotel than a home.
The wifi is very fast and there are multiple routers to choose from. The street is quiet, yet only one block from a major thoroughfare. We were not disturbed by any street noise, which was a surprise in the centre of the city.
Paolo is very practiced at giving guests excellent tips on walking routes to the major attractions, and there is also a sheet in the room with very detailed routes.
Only two negatives to report, neither of them very serious:
The breakfast is very basic with fruit, packaged pastries, and bargain-brand yogurt. This is fairly average for Italy, I understand, though we stayed in several b&bs on this trip that offered far more.
Be aware that if you should need to make a phone call, there is no phone available to guests and no help provided by Paolo or his staff. This won't be a problem for Europeans who will have their own mobile phones with them, but may be trouble for anyone from other continents who cannot use their mobile phones in Europe. We had to call our airline to fix a problem with flights, and found ourselves at a payphone in the metro station trying to deal with confusing instructions in Italian. (We actually had to go into a hotel to get help from a concierge just to find out what the hold recording was saying -- many thanks to them!) In the end it was an adventure to brag about, but it would have been nice to have a staff member at the B&B who could help us.
This lack of guest support is the only thing keeping me from giving Armonia All'Opera a rating of Excellent, but overall I was pleased with the B&B and would stay here again.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC