As everyone else has said, this is a great apartment which could not be more central, and has everything you need, from aircon to coffee machine. The terrace overlooks a little square just around the corner from the main Piazza, and, sure, there is noise - this is the city centre - but take that as a positive, pour a glass of wine, sit on your terrace and soak it up!
Everything is in walking distance and the local Interbus service is incredibly efficient and reliable if you want to venture up to Castelmola. Likewise, the cable car will drop you at Mazzarò where you can visit the beach 30m away, or a short walk to the right to get to Isola Bella where exploring is so much fun.
For longer excursions - I went to the Valley of the Temples at Agrigento - I highly recommend SAT tours.
Giovanni and his nephew Antonio were perfect, helpful and gracious hosts, fast to respond and even arranged my airport taxis for me. Their restaurant recommendations are spot on, too - take their advice on everything!! Thoroughly recommend.