The apartment is lovely! My family of 4 stayed for just over a week and had plenty of room. The apartment is well furnished and there's a grocery store 2 minutes away. It made the perfect "home base" while we explored Florence.
Serena was also the kindest host. Our flights were delayed coming in and we ended up arriving much later than anticipated. She met us at the apartment with a bottle of dessert wine and biscotti to make up for it! She was also extremely responsive when I emailed her with questions during our stay.