Cinzia's place is a nice studio close to Vatican City. It's located right next to the Roma San Pietro station, so if you choose to take public transport around the city, it will be no issue. However, I could walk to wherever I wanted to go with no issue (except the Colosseum, you should probably take transport there)
I arrived late, but the self check in process was easy and simple from the instructions Cinzia provided. The sofa bed can make a bit of noise/creaky. But aside from that, the studio was perfect. Hot water worked fine for me, even though I've seen some other reviews of people mentioning it didnt for them.
All in all, this is a great place to stay during your visit to Rome.