I cannot say enough nice things about this place. First, Cristina is an excellent host! She was very communicative and helpful. She will tell you her English isn't good, but she communicates perfectly. She even left us little welcome gifts (fruit, olive oil, etc).
Second, the apartment is beautiful. You can tell that Cristina puts a lot of effort into making it beautiful and maintaining it. The kitchen is well equipped, and it's all been recently renovated so the shower, washing machine, and air conditioner are all brand new. It's a very lovely place.
The internet is fast and the apartment is on the ground floor so you do not have to travel too far with your luggage.
The apartment is in a neighborhood a little away from the main tourist area, but nothing is more than a 15-20 minute walk away, and it takes less than 10 minutes to walk to the main tourist street. Florence is VERY walk-able.
We had a wonderful time in Cristina's lovely apartment and if we come back to Florence we will definitely stay here again!