If you´re going to sleep in Florence I recommend you going to the Youth Hostel situated in the east of the city. If you´re in the train station, take a bus and when you arrive there you´ll nedd walking one kilometre more-less in a park. The hostel was made in renacentist times but is has been restaurated. There are many youth people around 20´s besides older people. Breakfast is simple but ok and you can take it in the grass.
Yes, is really interesting visiting it thouth you don´t think sleeping there.