I was staying for 10 weeks in this apartment and must say that I had a really great time there.
The apartment: The apartment is very clean and has enough room for 2 persons. It has a kitchen, offering everything one needs to cook something (I cooked there a lot!). If you plan to stay there longer, there's also a washing machine (again, used it a few times). There are also some other amenities there, such as TV, hair dryer or air conditioning, but I never used them, so I cannot say anything about it. The Wifi in the apartment is fast enough for streaming services such as Netflix and Youtube. I watched a few series and movies during my 10 week stay there and had (almost) never any problems with the Wifi. It worked even better than the Wifi in the university of Florence...
The area around the apartment: The apartment is situated near the center. Walking distance to the center is about 20-25 minutes. But you also have a perfect connection with public transportation. There's a tramway station about 2 minutes from the apartment. From there it takes only about 10 minutes to the city center and about 15 minutes to the airport. There are also bus stops near the apartment, taking you to other parts of the city. About 5 minutes from the apartment is a mall with a big supermarket and different shops and restaurants, so everything you need for either cooking for yourself or going out for dinner. I also walked through the surrounding area at different times of day and night and it always felt very secure.
The hosts: I was already very happy with the apartment itself, but probably the best part about this acommodation are its kind and friendly hosts, Riccardo and Lisa. They responded extremely fast to all my questions and tried to make my stay in Florence as enjoyable as possible. Also, Maria from the neighbouring apartment was very helpful. I think that good communication with the host is something that cannot be taken for granted and which is very important (especially for long term stays), and with Riccardo and Lisa this worked better than you could wish for. One can see their dedication to being a good host!
So all in all, I really really recommend this apartment. I had a great stay there and should I return to Florence (which I really hope, because it is a beautiful city), then I'm definitely going to stay again in this apartment.