My wife and I just stayed here for four nights and really loved it. It was slightly hard to find the building, then slightly hard to figure out what to do once we found it, but once we did we enjoyed our stay immensely. The location is fantastic as you are in Campo de Fiori, which in the morning is a huge local market and at night a bustling piazza with bars & restaurants. It's also just about a mile from the Vatican, Coliseum, Pantheon, and even less to Travestere so the location absolutely can not be beat for exploring Rome.
The rooms were clean and modern, nice beds and a very nice bathroom. Nothing special, but it had everything you need - AC, mini-fridge, nice bed, modern bathroom, a small safe and a TV that we never used.
The only negative is the service - it's not that it's bad or we had a bad experience, it's just that is doesn't really exist. This place is much more an Air B&B than it is a hotel. We stayed here 4 nights and ever saw the owners/managers until our very last day when they were making sure we were out of our room at 11:00 AM. We arrived at 3 PM and no one was there to greet us or say hello, you were on your own to find it and then enter the security codes on the outside doors. To their credit they did list their phone numbers if we needed them, but you definitely felt "on your own" here so it's a better fit for more independent travelers.