La Casetta is a really nice little flat in the heart of the old town. It has a large bedroom/living space and a little kitchen upstairs (with an oven where you can make your own pizza!). Massimo, the host, was great and very helpful. We were greeted with some homemade chocolate cake.
The house is a good base to visit Villa Romana. There are many restaurants around (definitely try the one recommended by Massimo, it's great!).
The only thing was that we stayed there on a cold night, and the flat was not very warm.