Sara and her husband are excellent hosts. The apartment is exactly as described, incredibly clean, is in a safe neighborhood that has quick/easy access to two nearby grocery stores (and an outdoor market about 5-10 minutes away) and lots of good restaurants/cafes nearby, and is within a 20-30 minute walk to the city center. For people like me who packed too much for their trip, the apartment being on the first floor is also wonderful and makes accessibility much easier.
During my stay there she went above and beyond in regards to extras, such as providing a few bottles of drinking water, kitchen basics (like olive oil, pasta, etc.), and meeting me at check-in and providing information about the surrounding area and Florence, alongside ensuring I knew how to use the amenities (washer, AC, heat, etc.). For those looking to travel here in the summer, the AC is located directly above the bed in the loft, which is very nice. The wifi was consistently strong as well. Sara was also kind enough to help me get a cab when it came time for me to head to the airport. I would highly recommend this place to anyone coming to Firenze, whether it's just for a few days or for a longer stay. It's a beautifully designed space in a quiet area, and the hosts are incredibly kind.
Some fun stories from my stay here: there are two skittish neighborhood cats that like to sit out on the rooftops sometimes, and watching them was a nice reprieve from work while here. Every so often there was also an opera singer practicing nearby (thankfully never late at night, and never early in the morning).