I highly recommend Alessandro's house!
On the first day, our train delayed about 3 hours. He keeped in touch with us and waited us until 10:30pm. He was so kind to us and I'm very grateful to him.
About the house, it is located near the Duomo. It is easy to reach many restaurants, grocery shop, sightseeing. House is much bigger than my expectation. All amenities like iron, washing machine, air-conditioner, hot water relieved our trip.
Last day, he came to see us and reserved taxi for us. It was a very great experience to stay his house. Thank you Alessandro :)