Marcello's place is in close proximity to most attractions in Palermo. It is within a 5-minute walk from Teatro Massimo which is one of the largest opera houses in the world. Also, the apartment is super close to Mercado El Capo where you can enjoy local Sicilian food at good prices. The Palermo Cathedral is also like a 10 minute walk.
Marcello was a nice host and was always responsive when I had any questions about the apartment or local places to hit in the city
I would definitely consider staying at his place next time I visit Sicily and would definitely recommend the place for its convenience, price and location