Chiara's apartment is actually quite close to the Santa Maria Novella train station, but Google Maps led us in an indirect way that ended up taking twice as long. It IS definitely walkable -- and advised.

Chiara met us there, and she was quite pleasant and welcoming. The apartment is smaller than the pictures might indicate -- especially the bedroom -- but still enough space for the two of us. The decor was very modern and tasteful, and the glass door to the private garden is locked and secure. Unfortunately it was raining so we did not get to take advantage of it. Best of all, it was super quiet.