This is an excellent and spacious apartment in a fantastic location. Everything you need is here and the apartment is well maintained and clean. As others have mentioned, the WiFi is not the best - it is difficult to skype or facetime family using this WiFi because the signal is so poor. However, the rest of the apartment is excellent.
The location does mean that you get some noise from the street particularly late at night over the weekend. But you're in one of the best locations in Florence so it's difficult to complain! We never caught public transport. We were able to walk everywhere.
It's worth having a sandwich at All'antico Vinaio down the road and a gelato at Neri. Both are worth any wait. We also had excellent meals at Ciro and Sons, and Trattoria da Mario which were a little walk away.
Daniele was very pleasant, easy to communicate with, and was very responsive. He provided great recommendations on what to do and was very courteous and professional in his manner. However the only problem was that a deposit of 100 euros was required at check in. This had not been communicated prior. I would not have had a problem with this had I known before check-in. It was lucky that after traveling for four weeks, we had the cash with us. It was not a big issue but it was slightly uncomfortable and inconvenient.
Nonetheless, Daniele was great, we had a great time and we would definitely return! Grazie!