I truly recommend this place for short or long holidays in Florence. This a very clean, warm and quirky apartment with all the basics for you to prepare meals. There are local coffees and supermarkets at a walking distance and the city center does take more than a 25 min walk. The only downside that I can think of is the fact that the apartment is located near to a train line, which may disturb any light sleep.
Florence is definitely a magic place and if you are looking for a calmer and in budget stay for big families this is the place for you.