Roberta's apartment is lovely. It is in a perfect location for exploring Ortigia and the main sites on the Siracusa "mainland'. It is very clean, well maintained and we were made very welcome by Roberta's mother and sister; both of whom spoke much better English than our Italian!
Some advice if you are visiting in a car: The apartment is on a street which is inaccessible to cars and parking in Ortigia can be challenging! We asked Roberta to reserve space in a private garage about 200m from her apartment; there is also public parking (talete) a bit further away. Also, GPS systems do not work very well - ours seemed unable to tell the difference between roads just wide enough for a car and those which will just about take a wheelbarrow! My suggestion: dump the car as soon as you can and enjoy the charms of Ortigia on foot :-)