This is an excellent apartment in an excellent location. It is incredibly clean, spacious and kitted out for a long stay. We stayed for a month, during which we worked from the apartment. The wifi was good and we had no problems there.
Being close to the waterfront, close to Vuccira market and close to most of the city's tourist attractions is really ideal - I'd say this is the perfect spot for a tourist in Palermo! As others have said, the only thing is that the apartment can be noisy, but you quickly get used to it and it didn't really bother us! Thanks Giovanni!