Andrea was a great host. He was very communicative and already gave me several suggestions on what to do before I even arrived. The place is in walking distance to the train station and a tram line goes directly from the airport to his place. The flat is located just at the border of the touristic core of Florence which could not be better if you want to both easily visit Florence by foot and still also have dinner at a slightly less touristy place.
The flat was great: clean, modern and nicely decorated. The small but private bath is directly connected to the room. The AC worked well when needed and the bed was comfortable. Andrea even had prepared a bottle of water for the thirsty traveler.
The only things one might need to be aware of is that the apartment is in the third floor without an elevator. And if one is attentive one might sometimes hear neighbors or a train in the distance. But nothing that would be problematic (and I would expect that everywhere in the city of Florence).
I can highly recommend Andrea's place. I had a wonderful stay in Florence and I'd stay at his place anytime again.