You're in for a treat! Besides Roberto being an awesome host, his air BNB is placed in the heart of Palermo old town! You have the best attractions close by, at a maximum of 10 min walking, best places to eat typical Sicilian food (arancino, cannoli) really close by. If you rented a car, you won't need to drive it through your Palermo trip, though you will need to pay a daily fee to have it parked there, since it's a low traffic zone, but again, Roberto will kindly inform you of this and help you with everything.
The room is amazing and you have everything you need, small kitchen, great bed, a small balcony where you can see some of the church's and do some sightseeing, everything was clean and tidy.
Great place to stay! Do not hesitate