We only stayed one night at Luigi’s just to sleep. The apartment was large enough for two. We had parking in front of the gate, a huge supermarket across from the house and the sea promenade was around the corner. And for breakfast, we went to the Cafe Victoria fronting the sea. Perfect stay.
I would recommend at least 2 nights/1 full day in Cefalù.
Just be aware that the second bedroom has no door and you have to climb up and down some stairs. There are also stairs at the entrance to the toilet. Apartment is good for 2-3 persons.