We can definitely recommend Marco's flat. It is close to both the bus/train station and Ortigia as well as the architectural sights so you can easily walk everywhere. The flat is very comfortable with lots of pictures taken by Marco himself. Marco is a great host: He picked us up in Noto by car and drove us all the way to Siracusa. Furthermore, he has prepared a little guidebook with useful advice on what to see in Siracusa. So definitely a good choice!