Excellent experience! My first time with Airbnb, but definitely a good time.
The B&B has 3 rooms to rent, and one room for the owners. The owners are warm-hearted and welcoming young couple, and are helped by Andrea's sister, who is also very cool. They provided us with tips to get around (trattorias, best coffee places, go out etc). Privacy and social chats are well-balanced, me and my friend felt at home directly. They also have a beautiful dog. Normally I am not a dog- kind of person, but this one will not bother you (I even enjoyed it!)
The appartment is situated in an old monumental building (beautiful high ceilings, impressive staircase) and has recently been renovated (totally). So everything is nicely styled, fresh and bright, incl. the bathroom. The appartment and the rooms are very clean, and you'll have a good value Italian breakfast in the small but cute living/kitchen. The location is also excellent, 5 min walk to the metro (2 stops from Termini) and we even walked to the Colosseum (20 min).
I will definitely recommend this place to you!