My girlfriend and I had a great experience with both the apartment and Modestino. The apartment was perfectly located, clean, big and the wifi worked well. We met Modestino when we arrived in the morning and he was kind enough to explain some of the best places to go for dinner or aperitivo. He also went out of his way to let us leave our bags at his own apartment while we explored the city on our last day.
Definitely recommend him for everybody visiting Florence.