Giovanni's studio is nice and very well-located. Be mindful that there is no wifi in the apartment - it is however one of the cheapest places in Palermo considering its location. Giovanni was very flexible and accommodating during the check-in, even though we were arriving at 9pm.
Unfortunately, at the time of our visit they were refurbishing the place downstairs and also next to the apartment so we were woken up very early in the morning by drills and workers. There are also massive rubbish bins right next to the apartment which get emptied very early in the morning - again not the best if you plan to sleep past 6am :)