We had a lovely stay in Palermo here. The apartment is well-situated in the Politeama part of the city, a 20 minute walk from the centre of the old town and outside the ZTL (making driving much easier). If planning to park, it's best to make note of the blue (paid) and white (unpaid) spaces in the area and to swot up on your parallel parking. Finding a spot in the evening can be a bit tricky but it is fairly easy to find free parking in the afternoon, although the blue spaces directly outside the apartment were seemingly always filled.
The apartment itself is spotlessly clean and extremely well equipped, including coffee and a selection of percolators. The sofa bed is comfy and easy to get up and down. The air-conditioning/heating system works well and is easy to use once you get the hang of it. The shutters act almost as blackout curtains in the night, and although there is some noise from local bars in the evening, this is more or less the case throughout all of Palermo.
We would highly recommend this apartment for your stay if you are visiting Palermo.