Thank you Elaine for your feedback!
As stated on the ad, the apartment is in a basement and you can see from the pictures that there aren't windows, except for two very small ones in the living room. That's why we have dehumidifiers in every room.
As for the boiler, although it is new, it's capacity doesn't support 5 showers in a row, as pretty much most boilers in Italy and that's why we ask our guests to wait a little in between showers. I'm really sorry about that, but unfortunately that's very common in Italy.
Nevertheless, we were always reachable and available to guests. :)