Excellent for a stay of 4 nights or less and decent for longer stays. Would give it 4 stars based mainly on location.
Pros:
1. Location - within 15 minute walk of almost all major tourist sites
2. Location - wonderful Campo di Fiori neighborhood full of life and food
3. Location - quiet side street
4. Size - very large bedrooms and living area (by euro standards)
5. Hosts - very kind and accommodating
Cons:
1. Size - Bathroom 2 is extremely small (even by euro standards) and should be considered a half bathroom.
2. Size - Kitchen is quite small and lacks many basic cooking tools.
3. Elevator - exists but is obsolete; must climb 8 steps to get to it, holds only one person + one suitcase, and moves so slow it is not worthwhile.
4. Neighbors - upstairs made much noise walking in heavy shoes on wood floors at all hours of the night.
Summary: Location is ideal, size is ample, and hosts are lovely, would recommend for a 4 night stay or less. We stayed 12 nights and found the kitchen very limiting and 2nd bath only partially useful and elevator useless. We were three people and paid USD $140/night for end of November and thought this was perhaps a bit high for the season and quality. However, for 4 adults during tourist season, this would be a very fair price. Recommend to anyone not needing an elevator for a short stay in Rome.