Nonetheless Julia, who manages the apartment, was very helpful and organized a technician to look at the boiler, then fixed it for the moment, forewarning that it will happen again if you separate parts not replaced promptly.
A big plus is the ideal, central location.
However, we would not want to live in this apartment again, if you like it clean and comfortable, this is not the right place.
Thanks anyway to Julia who went out of her way and we really appreciated that, it's not her fault.