Elena and her husband gave us a warm welcome, as well as plenty of tips for getting around. The flat was luminous and chic and describing it as extremely clean would be an understatement, it was spotless! We checked in four-star hotels that were not as clean as this place.
Elena also had a contract draft, which she had us sign in order for everything to be in legality (big thumbs up for that).
The flat is accommodating and located close to the train station, shops and restaurants (I highly recommend Osteria dei Centopoveri) and within a short walk from the hystorical center so we did not use the public transportation at all, in spite of having Firenze cards.
If we ever return to Firenze (hopefully) we will surely return to Elena's place.