We have spent one week in with our 7 months-old daughter in Giuls appartment in Palermo. The appartment is really nice and clean. It is located in the center-center of Palermo. Guils was very welcoming and helpful with any question we had. She is also giving good suggestions of where to go etc if you want.
Parking was not a problem as there is a square directly in front of the building in which the appartment is located.
The appartment was very well equipped with everything we needed. The building complex is upscale and has a doorman and an elevator. The bedroom is upstairs, where we could even accomodate our baby bed. The weather was not nice to us, so we did not get to use much of the lovely terrace. There are various bars and clubs in the neighborhood, so for night-owls this is perfect. For us with a baby, it was a bit noisy in the late evening/night (during the day the appartment is absolutely quiet!), but the city is obviously working on enforcing noise levels and Guils said that the issue should be resolved very soon. This said, we can highly recommend Guils' place.