I stayed at Libera's apartment for just a couple days in Florence and it was absolutely perfect. The location is AMAZING. You are in the heart of Santo Spirito, which is one of the best parts of Florence imo – less touristy, less crowded, but you have incredible restaurants, trendy cafes/coffee shops, and local shops.
The apartment has everything you need and is tastefully designed. There is also a really cool upstairs lounge area. Personally, I didn't find the apartment very noisy as other reviewers said! Sound is expected in any big city in Europe. I actually slept amazing both nights. The bed is extremely comfortable, and if you are sensitive to sound like me, just bring some ear plugs :)
Libera made the experience so memorable. She is incredibly kind and helpful, and I loved being able to share some conversations with her (in Italian). She helped me with my (very heavy) luggage, and let me keep my bags there a bit after check-out.
Highly recommend!