Guido's apartment is perfect in every way. The location is unbeatable, with the beautiful Santa Croce church at the end of the street, and a less than 5 min walk to the Uffizi Galleries or the Duomo. Maybe 10 mins to Ponte Vecchio and the Santo Spirito neighborhood. There are lots of lovely restaurants and shops nearby (don't miss the perfume store across the street, it's one of the most beautiful shops in Florence).
The apartment itself is comfortable, spacious, and nicely decorated and has everything you could possibly need, even for a long term stay. The kitchen is really well equipped, the beds are firm, and there's even a hairdryer in the bathroom. The main bedroom is huge with lots of closets, and the second bedroom has two twin beds that are joined so it's well suited for families too. There's a lovely little terrace off the kitchen with a pretty view of a leafy courtyard. It is the perfect place to relax after a long day of sight seeing.
Guido was warm and welcoming, he was communicative throughout our stay and always available for questions. In short, a fantastic apartment and a perfect host!