Pluses: great location at stone’s throw from Vatican gate, nice and mostly quiet building (excluding some loud partying across the street on Saturday night). Cleaning was adequate (except stains on curtains).
Minuses: the flat is need of some maintenance. Plumbing was problematic making hot showers a challenge. Things like these should work flawlessly, as the last thing you want coming home from a long day of sightseeing is a temperamental shower. I wonder how this escaped the attention of the otherwise very professional property managers. Cab rides from and to FCO were arranged seamlessly by the company, but one driver would not take credit card; with Uber black offered in the city we regretted opting for the somewhat more pricey in-house option.
Bottom line: decent option for a Vatican focused visit but ensure the company has fixed the hot water issues, and use an app for airport transfers.