Good points:
* The location is simply great for tourists. It's in the heart of Trastevere!
* Communication: Giuseppe replies immediately, he is respectful and friendly. The sink was blocked, I told him and his brother repaired it within some minutes.
* Check-in: it's perfect, since it's automatic and very clearly explained.
Not-so-good points:
* The place is just tiny (I was on my own, if I had been with someone else, I would have felt claustrophobic) and not properly aired, because there's only one opening (door + window, ok, but on the same wall, one next to the other), and the "patio" to which it leads is super small, so there is no airflow and the whole place is permanently humid. Also, the "patio" is so small (less than 2 sqm) and enclosed that it wouldn't be pleasurable to sit there.
* Some basic stuff are missing: no broom, no chair to sit indoors (just benches with no back), no closet or piece of furniture with drawers
My conclusion: if you go to Rome on your own for a couple of days and just need a place to sleep and take a shower in a nice tourist area, it may work, but you will find alternatives with a much more convenient price/quality ratio on Airbnb.