We really enjoyed how central was the apartment. Everything we wanted to see was reachable by foot. The apartment itself was spacious and clean. Having one bathroom for 5 people who pretty much have the same schedule can be challenging but we managed. Also, it was quite an exercise to go up all the steep stairs but nothing a person who has no difficulties moving couldn't manage.
Regarding parking, it can get very expensive. If you want to park close to the apartment, prepare to pay at least 40 Euros per night to park in a garage nearby. However, I think this is normal for every bigger city so we were prepared for this.
Overall, I recommend Edy's apartment. It made Florence a better experience.