Even before actually staying at Guido's apartment, he was very accommodating, helpful, and friendly - messaging us back and forth to ensure that everything was taken care of properly for our stay and to see where he could help us.
My wife and I were in Florence for our Honeymoon and walked all over the city for multiple days and Guido's apartment is *perfectly* situated in the heart of Florence and just a 3-20minute walk from anything you would want to see or do - it really was the perfect location. Nearby (within 1-5 minutes) are some of the best gelato, pizza, and classic Florentine food options you could ask for.
The apartment itself was very nice as well and perfect for what we were looking for: Surprisingly spacious, charming, nice bathroom, full kitchen, an AC unit in the bedroom closet, and beautiful windows in the bedroom overlooking the street. Some reviewers cited some loud street noises, but aside from the occasional motorbike, we didn't notice anything at all.
Overall - if you're looking to spend a few days or weeks in Florence, Guido's place is the perfect place to call 'home' to be uniquely and wonderfully situated to truly get the feel of Florence :)