the problem with the flow of water is a more general problem of the island of Mykonos and not a problem of the house.
Efforts are being made by the competent authorities to upgrade the desalination system but still exists. Unfortunately, the island's infrastructure is insufficient for the number of tourists it welcomes every year.
However, there is an extra water tank installed in the house to avoid the specific problems.
As for the hot water, you mentioned it to me in our communication, I even sent a plumber, who confirmed me that there was absolutely no problem with the boiler and even you personally confirmed me that there is no problem so I do not understand what you write.
Anyway, I am glad that you had a great time and hope that Mykonos will remain unforgettable!