Chiara is a great host. My train was delayed for a long time and she still waited for me. She is friendly, easy to talk to and was very helpful. She highlighted a map of places to visit and great places to eat.
Her apartment is nicely decorated and very interesting, and most importantly, close to the subway Firenze Rifredi, which is literally one stop away from Firenze Santa Maria Novella, the main station of Florence.
I would recommend with staying at Chiara's place.