What a unique and wonderful home to enjoy. My partner and I probably enjoyed the apartment too much - every evening we were up on one of the two balconies in the birds nest enjoying wine, cheese and meat. One night we even decided to skip dinner out and make pasta instead because we didn't want to miss out on the view. Having said that, part of the motivation was probably to avoid the 5 or so flights of stairs, but hey, how can you get views without some stairs!
The apartment has everything you need for a nice time in Florence, and is in the centre of town too, walking distance from everything. We should say that the kitchen is tiny, and my partner is 6'5'' but we had a laugh prepping dinner inside nonetheless.
Unfortunately Fede was away for the weekend we visited so we can't comment on his hospitality (though he was in contact at start and end via message). Instead his friend Romina met us at the apartment and showed us inside. She shared with us her "magic" Google map which plotted her favourite spots. This was useful and good to have but couldn't replace a real life tour of the neighbourhood I don't think. Regardless, we loved our stay.