Our stay here was wonderful: it was incredibly helpful to be picked up from the train station by Giusy's partner, daughter & friend, who helped us with orientation and some recommendations. Before checkin, Giusy had responded swiftly & in good English to our queries.
The flat is perfectly located in the centre of the "Historic Centre" district, with many of Palermo's sights & restaurants etc an easy walk away. A good supermarket (Carrefour) is less than 10 minutes walk away.
The apartment is secure, quiet, stylishly modern & comfortable. We only had a night there (en route from Lipari to Mazara del Vallo) but would definitely stay again.
Bisso Bistrot, the restaurant downstairs, was recommended by our welcoming committee (as well as by Lonely Planet), & it was excellent. We were also fortunate enough to arrive during a gelato festival ;-)
While checking the photos for this review I was surprised to realise that we'd actually stayed in another of Giusy's properties in the same building, "Quattro Canti Luxury Apartments" https://www.airbnb.com.au/rooms/9455104. So the photos of that listing are accurate (other than maybe a lick of paint) but I can't comment on the photos for this listing :-/ I'm sure that this is as good.