If you're looking to stay in Florence and want to avoid the hectic centre but be within walking distance, Coral's place is excellent! You're 10 mins away from the centre and 20 from the train station, the area itself is a lively but with a local feel to Florence.
Coral's guide to local places to eat and go is really good and you'll find some great places away from the usual tourist traps!
Would definitely recommend if you're looking for a short stay in Florence!