If Silvia’s place is available for your travel dates, just stop what you are doing and book it already (and maybe also add an extra night in Florence to your plans, because it will be hard to leave).
It doesn’t get any better than this. We were a family of 5 adults traveling across Europe, and, after a long and careful research, we booked Airbnbs for all 9 cities.
We had great experiences all over, but Silvia’s place will always remain BY FAR, the best one we had.
I almost don’t want to spoil it for you by going into details of how amazing it was. So, really, just go ahead and book it.