Great spacious place with good amenities!
To avoid miscommunication, do understand that the host is required to pay tourist tax for each rental, so she will ask us to pay her in cash EUR3.5/pax/day, as paying via Airbnb would translate as income which will be taxed again by local authorities.
So let's pay accordingly and enjoy our stay thereafter! The host provided a good map on various attractions and recommended some local snacks place. She also allowed me a late check out which facilitated my itinerary.
Overall, a very pleasant stay at a good area near the Vatican!