You can't find better :
Marco is really welcoming, available, kind, a great host.
The apartment is really beautiful, well decorated (with amazing photos, guess who is the author ;) ) perfectly clean, and contains all that you need.
Perfectly situated in the center, mid distance between Ortygia and the Archeologic Park, and just near the central station (bus and trains). One more thing : the supermarket is your neighbour !

Highly recommended !