I most certainly enjoyed staying at Stefania's place. The place is fully furnished, clean and has a really homely feel to it. It sort of grows on you, and after three weeks I was a bit sad to leave :-)
The location is ideal for sightseeing - all major sites are within walking distance, the street is closed off for traffic, the neighbourhood is lively and vibrant, and there are plenty of restaurants and shops to choose from. If you're coming by car, there are a couple of garages nearby, which can help you sort out the ZTL problem.
When I came to Florence, my flight was a bit early, but Stefania's husband was still able to meet me and kindly explained everything I needed to know about life in Florence. Both Stefania and Fabio were excellent hosts, and no questions went unanswered.
I sincerely recommend this place.