We spent 4 weeks in Silvia's place in September, and overall it was quite good. Silvia and her husband greeted us kindly when we arrived. The apartment is spacious and we really liked the location.
This was our second time in Florence, so we knew we wanted to be in the Oltrarno area to experience more of the local life, see various artisans' workshops, etc. and the area did not disappoint. It felt safe and was very convenient to get groceries, walk to the train station, and sightsee.
There are a few minor inconveniences that we should mention for any potential AirBnBers to be aware of. To put it in perspective, in spite of the below, we would certainly consider returning here in the future.
1. The AC is a portable unit with a thick tube (about 15 cm diameter) that feeds outside. But there isn't a fitted spot in the window to place the tube, so in order to run the AC, the window has to be somewhat open, which renders the AC less efficient and also makes it difficult to use at night since the open window lets in noise and mosquitoes.
2. The water pressure in the shower isn't great and is not very consistent.
Apart from that, the kitchen isn't very big (just 2 burners and a toaster oven, no microwave), there were a few small ants (for which Silvia had laid out ant traps), and the apartment is located up four flights of stairs, but you get used to it quite quickly. Again, these aren't complaints so much as things to be aware of.
Overall, a good spot to stay in, but could use a few minor improvements. We would return.