I had an amazing 2 week stay at this apartment. I didn't meet Mario but his wife Elisabet was waiting for me when I arrived (my spanish is very poor and Elisabet speaks more English than Mario). Elisabet was lovely and showed me around the apartment and the complementary snacks and drinks. There are lots of useful appliances like a hairdryer, iron, toaster, as well as other essentials like cooking oil, salt, tea, coffee. I didn't use the oven. The wifi is good.
In terms of the noise from the street, after a couple of days I had adapted and didn't have any issues (I have lived on a main road recently and am used to traffic noise). If you struggle sleeping with traffic noise it might be better to stay elsewhere.
It is a nice building and felt secure. The pool on the roof is lovely and has a great view.
The area is amazing. A short stroll to all of Palermo soho and Hollywood's cafes, bars, restaurants and shopping.
Overall I had a fantastic stay and would absolutely recommend the apartment!