My stay was really good. Here are some specifics:
The location is great!! It's a 5 minute walk to the Vatican museum entrance, and even closer to the metro that will take you anywhere. There is a supermarket nearby and some good bakeries.
The room is bigger than it looks in the pictures, and the bed and pillow were very comfortable. There was plenty of hot water, and I could turn on the heat in my room. There was a US/Europe/other outlet converter that worked for my computer.
Last but not least, the hosts were the best!! I hardly know Italian, and Massimiliano's English was not much better. But we both enjoyed speaking to each other and trying to understand what the other is saying. Donatella only speaks Italian, but she is good at figuring out text messages. Massimiliano is very kind and helpful with translating in person. I felt like I could trust them alot. They both seemed very honest and open about what they were thinking. And I found out Donatella and I love some of the same poets and authors. :)