We stayed for a week in Antonio's very charming flat. It is extremely well situated in the heart of Palermo's old town and with the two top restaurants Ferra and Ottavia Nota in close walking distance. We were greeted by Antonio's neighbour Tiziana who helped us with internet and an extra sheet for the bed, as we were friends travelling. We were in the flat in late September and it was still very warm even at night - the air con helped a bit.
The only minus are the beds and the mattresses. They are not that comfy and quite hard.
Tiziana booked a taxi for us as we had to go back very early in the morning - that was very helpful. Also, we had some minor issues along the way and Antonio replied to our messages very quickly. All in all we would recommend it.