In one single sentence: we had to leave the apartment in the middle of the trip because of the bathroom smell, and the lack of water pressure and hot water in the shower.
We sent a message to Catrine about the lack of hot water and the answer was literally "to turn on the hot water of the sink while showering (...) Usually if it happens this trick helps". I don't know what you guys think, but I think that it is obviously a permanent problem, a sloppy solution and a terrible waste of water. Besides, the water pressure in the shower wasn't enough.
I have to say too that she come to the apartment with the owner (or the plumber, first she said one thing and later she said another) the day after to try to figure out was going on (that was nice) but she said that the bathroom didn't smell at all, that probably the smelling was "the totally window closed ambience, when used". One more time, I don't know what you guys think but I find that comment even offensive. I am in my 40s and I am able to know the difference between the smell after using the bathroom and other kind of smell, the drain smell for instance. Besides, that smell sometimes was stronger in the morning or when we arrived to the apartment after being out during all day.
She said that I was the first person in all the time that said something about the smell. And you know what? I believe her (regarding the bad smell, the lack of hot water pressure was obviously a permanent problem because she had even a trick to fix that). But she should have believe us. Maybe it has not happen ever before, but IT HAPPENED WHEN WE WERE THERE.
She didn't give us a solution, she only said that it didn't smell and if it did, that we should to keep the window opened. We had no other option than leave if we wanted to feel comfortable in such a beautiful city as Rome.
It is not a whim to look for another place and leave the place you are staying in the middle of the trip. It is not a whim to spend a considerable amount of money in two apartments. We left one day and we asked to be refunded for the days left though the airbnb app, changing the day of departure (not from the day we left, from the day after we left so maybe she would be able to find a new host, that's an evidence of our good will). She didn't refund us any money.