Beautiful apartment! My husband and I stayed here on our honeymoon and we loved it there. It was very clean, comfortable and spacious. Just be aware you have to climb about five flights of stairs to get to it which is challenging with luggage but it is totally worth it! The main door to the apartment complex locks and the door to the actual apartment also has a nice sturdy lock if you're concerned about security. The complex was also quiet so we didnt have any problems with noise.
The best part is that it is south of the river so it is slightly quieter but you are still only a few minute walk from most of the main attractions. There is also a really nice piazza right behind the complex with amazing restaurants and a mix of locals and tourists.
Alessandra was easy to get in contact with and made sure everything was very easy! We would highly recommend this apartment to others and stay here again when we return to Florence.