I understand that Rome is an ancient city and that there will be issues with old houses and old pipes, that having been said, the sewage fumes in this apartment made both myself and my travel companion ill. The host clearly knew that the sewage was an issue as there were air fresheners everywhere. We both got headaches and had to sleep, on the sofa and under the windows, with the windows open every night. When we left, our luggage and clothes smelled like sewage. This went beyond unpleasantness and was a medical issue.
On top of that, Daniele was a non-responsive host. Our room was not ready on time and we had to message him several times in order to gain access. He was monosyllabic in his responses and we did not feel comfortable approaching him about the sewage fumes.
I suggest you choose another space to rent.