The apartment is great and just beside the archeological park. Not so close from Ortígia, but it was a nice 20-30' walk.
Valerio is super nice, he was there for all I needed, gave me great tips, provided breakfast and even picked me up in the bus station!
It is located in the forth floor, but luckily for me (with my huge bag) there was an elevator.
I will definitely go back if I have the chance!