I didn't meet Federico personally, but I can say that he is a very kind person. I think it was really important for him that we will have a nice stay in Florence. His flat is amazing, it's very big and cosy. You have everything you need there, you can even play some darts. He wasn't there at the time we visited Florence, so we had the hole big flat for ourselves. But even if he would have been there I guess it would be fun with him. He let a note in the flat with recommendations about Florence and even a bottle of his favourite wine as a welcoming present. So we could really enjoy our stay and after a hard day of visiting all the sights we could relax on one of his couches in front of his big tv;)
I would really recommend his flat and I would also go there once again if I will come back to Florence :)