Our stay in Milan at Francesca's apartment was a great experience. The apartment is bigger than it appears an it is really well located and quite in a beautiful building, just between the Duomo and I Navigli, also you have a Metro station a few steps from the door. We did not have any problem and Francesca responses are quickly. When we arrived she was already waiting for us at the front door.
Ask for extra charges, we had to pay and extra charge (cash), because we stared 9 days so there was this extra of cleaning (that it was already included in the Air BnB account).