Maria's apartment is a gem in Florence historical district. I already stayed in several AirBnbs and I can say without doubt this was the best one we ever got.
The location is great, you can reach all the city attractions just walking a few minutes.
The apartment is on a old building with some steep stairs until the second floor, but inside it's completed renewed and fully furnished. And it's huge. I'm sure you'll enjoy it as we did if you book it.