Jacopo's place is great in every way. First off, he was always quick to respond, on time for both the check in and the check out and also very friendly.
The check in and the check out both were easy and painless. The location - in my opinion - is superb as it is less than 10 minutes from the train station and just as close to the city centre (think the Duomo or Palazzo Vecchio) but it's in a less touristy neighborhood so it was quite quiet overall. It was clean, had all the needed amenities, not much else to be desired. My only recommendation is to install a bathroom fan or something so that the bathroom can dry out quicker without keeping the window open as the apartment gets cold this way (in the period of season changing at least).
Great place overall, highly recommended, and I will come back for sure.