We got in love with Florence. It is the finest city we've ever been. We'll have to come back some time as two days is not enough (not even close) to know the city in full.
Casa Colona is a beautiful, full equipped and excellent located place. Just walking distance to all major attractions and a stunning view from the balcony.
Rosy has lot of excellent suggestions too. Contact her about it when you do your planning for your stay, will help a lot.
Highly advisable!!!