My wife and I had a great stay in Giulio's apartment. We found it very clean, spacious and bright with all the amenities you would expect and more. The decorations and furniture are very nice and feels classic Florentine! The hosts were very friendly and communicative over mobile and the younger brother was very helpful on check-in with restaurant recommendations etc.
The apartment is in a perfect location for exploring the beautiful city of Florence and even though it is on a busy city street it is very quiet inside - you will sleep soundly there!
Highly recommended.