The apartment is a well built place in an excellent location, with all the popular attractions (and the bus station) just a few minutes walk away. It has a comfortable leaving room with a collapsible table, a very nice kitchen with stove, oven, microwave, and fridge, and a bedroom perfect for two. The toilet is small but functional. The shower is up three steps, built in the most original way. It works perfectly fine, even though the water pressure is low and the hot water does not run for long, so you got to be prepare for quick showers. The place compensates for this by being a few steps from the supermarket and a few steps from O'Cafe, a great place that Elisabetta recommended in which you can get the most delicious coffee and pastries (great for an awesome breakfast or a relax bite after a long day walking).
Elisabetta is a great host, attentive and practical. She received us at the apartment and immediately gave us a map and recommended places to eat and to get Gelato, all of which were great choices. She also answered immediately when we had a small problem with the washing machine, which now is fixed.
This was a comfortable and enjoyable stay that we definitely recommend, we wouldn't hesitate to call back for our next trip to Firenze.