We stayed at Stefania's place for 5 nights during the children's book fair and we had a great time!! Stefania is an incredibly nice and helpful person and we felt very much at home. :) The pasta on our last evening was amazing, thank you so much!
To the centre of Bologna one can walk in about 25 minutes or take the bus that leaves directly in front of the house. :) To the fair it's either 35 minutes by foot or about 20 minutes by bus (walks to and from the station included).
So overall it was just perfect for us and we had a great time! Everything it says about the flat and about Stefania is true, it's a great place to stay and she is a wonderful person. :)