You can be at the main Florence attractions (including David) with a 15-20 minute walk. The neighborhood is clean and safe and there are shops and cafes all around. I would say it fits a couple comfortably, 3 people ok - but two couples is a stretch - the bedroom bed is nice but the sofa bed not so much. The apartment has been modernized and has everything you need. Florence is known for their mosquitos, and since the place doesn't have an AC unit (most don't in Florence) I'd think twice if you are going in the summer months if mosquitos bother you, since you will have to leave the windows open.
Thanks again Anna.