Thank you very much for your feedback.
We're still investigating about the shower issue, I'll email you privately.
Regarding the air conditioning you've just forgot to empty the water collector placed outside the house. So it leaked from the inside.
The boiler in the kitchen has been found switched off during the inspection at check-out. Perhaps you've just switched off by mistake. It is quite common though. The property owner has advised about it.
We're sorry that you had experienced no internet connection for 24 hr.
I'm glad to hear that overall you enjoyed your stay and look forward to have you back in Sicily.