This is a very well-situated flat, only ten minutes by foot from the airport bus service. The flat is comfortable if not luxurious. It has everything you need, including a lovely large terrace. Daniela has all kinds of books in Italian and in English, so you won't run out of things to read. I would definitely return.
Daniela is very helpful with suggestions -- just ask. Palermo is an extremely interesting city, rich with possibilities, so you will not be able to do everything. But a great many of them are within walking distance of this flat.
One thing I would suggest, if you are sensitive to traffic noise, is to bring earplugs or noise-cancelling headphones.