I would not recommend this Airbnb for people who don't speak Italian and who are not used to the smell of cigarette smoke in an old house. Communication with Donatella leading up to my stay was nonexistent and there was no prior warning that her brother was going to be greeting me instead of her. As a solo female traveler, I did not feel safe in this space and decided to end my stay early.
I believe Donatella and her brother mean well but this was not a pleasant stay and I would not recommend unless you a) speak Italian and b) are used to living in a house of smokers.
That said, there were several other guests in the house at the time that seemed to be enjoying the space (they spoke Italian and had lived there previously) so if that is you, then this may still be a good option for a very affordable price. The other guests were nice and helped me communicate with Donatella and her brother.
The room was big and clean. The house is close to the metro and the Vatican.