For future travelers:
The host tries to charge additional €30 in cash upon check-in as a cleaning fee. Even though it was specified in the description, there is a separate field for cleaning fee during booking process and the host has to put it there. Travelers don't have to pay cleaning fee in cash upon check-in (according to Airbnb rules). That issue unnecessary delayed our check-in for ~5hours. But everything was solved after a lot of back and forth with airbnb support.
Location is amazing. Close to Vatican. And there is a nice fruits market in the next building.
The flat is small and is generally enough for solo travelers, but a bit too tiny for 2 ppl.
Cleanliness-wise: there is bunch of black mold (got pictures) in the shower, which is not good for health. Judging by the amount of it - it looks like it's been there for weeks if not months.
Definitely won't stay there again as check-in caused a lot of stress.