The view, the view, the view! If you can handle the 68 steps (yes, we counted), Cesare's place is well worth the climb. The terrace is small (but bigger than we thought it would be, based on the picture), and the two of us ate most of our meals outside. The living room is wonderful -- airy and light, with its own great view, and we made good use of the giant table and the stereo system. The upstairs (double) bed is comfortable, and the air conditioning in the bedroom worked well. The kitchen is well stocked and easy to use, and the bathroom is small but functional.
The only issue we had was that there's not a lot of storage space -- just one dresser and a small space for hanging a few things. (We ended up using the second bedroom for storing our suitcases.) But we were there for a whole month and had three months' worth of stuff with us -- if you're staying for a normal vacation length of time and have a normal amount of stuff, that probably won't be an issue for you!
We did not meet Cesare, but Nicoletta was great -- full of suggestions and advice, and very concerned to make the place welcoming for us.