First of all, and most importantly: Stefano/Annalisa are - amazing - hosts. Incredibly kind, helpful and open to leave you with coffee according to your preferences. 5/5 if possible even more.
Concerning the apartment:
Disclaimer: My GF and I are quite sensitive to noise - so this is according to our requirements.
The appartment is located well in the center center, right next to Palermo Centrale (3 minutes by foot). Accordingly, the street is quite noisy and hectic - so don't expect to live in an idyllic neighborhood in peace. Everything is easily accessible (Buses, Supermarkets, Parking Spaces for Rental Cars are nearby as well).
The appartment looks like the picture so no negative experiences here. Well equiped kitchen and clean bathroom. The fridge works fine as well.
Unfortunately, the living room is quite dark as there is no windows. The walls of the apartment are pretty thin, so you hear a lot of noise from the neighbors and the other appartment H. Especially, since there are kids living above trampling until at least 22:00. Stefano was kind enough to offer contacting them and be less noisy. As it was only til 22:00 we refrained from this option.
The thing that annoyed us the most was the loud engine of the water provider right next to the window. It was going on even during the night as it's connected to the other apartment as well - so you are dependent on whether the others go to bed early or not. If they don't the engine will keep running until 0030/0100, which was VERY uncomfortable. Stefano told us that there will be another, quieter engine coming but that didn't help our situation. As the engine is right next to the master bedroom window, I can barely imagine that this will be a lot better, but if it will be this is going to be a major improvement.
Due to the noise circumstances, we would have given the apartment in general a 3 out of 5 - BUT: The hospitality and generosity of our host put it up to a 4/5 for us. If you are not sensitive to noise this is a great apartment. For us, it was a reminder that we will better take an apartment out of town and take a rental car to get around and have a more idyllic stay :)
Grazie Mille Stefano e alla prossima volta!