I'd recommand everyone who goes to Florence to stay at Francesca's place. The location is great, you're not in the busy citycentre (wich can be very crowded and hot during summer), but nearby Piazza Michelangelo (you would visit that, because of the amazing view, now you can walk by it every day when you walk to the centre)
When we arrived, she already did some shopping (juice/ wine/ cereals etc.etc.) because there isn't a groceryshop nearby. If we needed anything, we could ask her.