Convenient location in old Florence, five minute walk to the Ponte Vecchio, three minutes to Ponte Trinita and the Arno. Walk everywhere, no need for taxis. Some good restaurants very close (especially Cinghali Bianco), shops, grocery. There's a food market every weekend in the San Spirito piazza just outside the door. Only downside is that the piazza attracts some, let's say, colorful characters, and gets a little noisy at night on weekends.
The apartment is pretty much what is advertised, though watch your head as the ceiling slopes in two directions in the main living area. If you're tall, be especially wary. I whacked my own noggin more often than I care to remember. But all else is fine.
Sara, our hostess, was fantastic: always available, and very helpful throughout.