I have to say Claudio is a great host! A super nice guy who not only reply inquires in a timely fashion, he was also very helpful in answering questions that I had during my stay.
His apartment is located at a central location, just a few minutes walk from Mercato Centrale, Duomo etc; 10-minute walk from Florence SMN train station.
I would definitely recommend Claudio's apartment to my friends and won't hesitate to stay at his place again in the future.