We had a great time staying at Freddy's place! Due to some issues with our first acccomodation in Palermo we were in a rush to find a new one - Freddy was super nice and flexible, letting us check in late at night.
As many have already pointed out, the place is small and it takes 100+ steps to reach it, but having your own terrace is definitely worth it. Despite being located close to many bars, the place is very quiet, you will have no problems to get a good night's sleep there. Recommended!