This place exceeded our expectations. It was the most modern, comfortable, and thoughtfully accommodated airbnb we stayed in throughout a 2-week trip to Italy. Stocked with a coffee-maker + coffee pods, decent wifi if you need, a big bed, an updated bathroom (warning the bathroom walls are mostly glass), a safe, and a separate room for luggage. There was a small walkout balcony (4 stories up) that overlooked Campo De Fiori -- a lively piazza with a morning/afternoon market that sets up, and often live musicians performing in the early evening. We read several reviews here that the noise from the square was a little much at night -- we found it perfectly pleasant, and the large windows dull the sound really well.
Perfect area for us, ~15 minute walk to several high-profile sites (Pantheon, Trevi, etc.).. 30-minute walk to the Colosseum.. 15-minute drive from the train station (Termini)
After long, tiring days touring around the city, we always found ourselves excited to come home to this place... so comfortable and pleasant.
Tiny warning that you'll need to climb several flights of steep stairs to get up to the room (though our host helped us with our bags when we arrived!).