I stayed one week at the apartment of Giuseppe, which I can highly recommend. The description as well as the pictures shown on the website matched exactly the condition that I found on-site. The apartment is tastefully equipped and impresses with cleanliness. It is well located very close to the city center. Piazza del Duomo or Via Etnea are located just a 3-5 minutes walk away. Giuseppe is a very good host, too and gave answers to mails very quickly. Moreover, he speaks Italian, English and German.
Thanks again to Giuseppe. Ci vediamo presto!