The flat is really great: well located (25 minutes walk to the Duomo and city center, or less than 10 minutes in metro), very clean, quite big for a studio, with Air Conditioning, and equipped in the kitchen if you want to cook your own meals (which is useful with kids).
We stayed 2 nights, with my husband and 2 kids (3 years old and a baby), and we enjoyed it a lot!
Camille