Mario is a wonderful host who really takes his time to tell and show you around the house and Siracusa. He knows good places to eat and to do some shopping.
The place itself is quite spacious. However beware that it is the top floor and be prepared to take a lot of stairs. Especially with a kid and a stroller it can be difficult.
Also beware that the heaters are very difficult to operate and of them did not work at all. Only blew cold air in the room. The others were either very hot or very cold (December). The bathroom did not close and lock, which is not handy for friends.
Also be prepared for the mosquitoes.
Finally, parking is almost impossible in the neighborhood. Neither weekend nor midweek. People park for free to enter Ortigia leaving you no space for your car close to the place.