Everything was perfect in terms of cleanness, heat, comfort, location.
The wifi didn't work in the dormitory. The common rooms where the wifi works is closed during the night so if you can't sleep and you want to use the wifi, you have nowhere else than the bathroom to find a little stool and to use the wifi. There, the light switches off every ten seconds. You have to wave to the detector for the light to come back.
And when the common room is open, there may be a family party with children running and crying everywhere.
It was impossible for me to rest peacefully in this place neither to work on my computer in good conditions.
And the breakfast was mainly junk food. I only drank water.
I regret my choice. I would have prefered to pay a bit more and spend a better time in Palermo.