The communication with the hosts was excellent. They were keeping track of our trip when going to the apartment and explained to us how to get there. They were also flexible with the check-in time since we had miscalculated the arrival time and had a friendly attitude. They even welcomed us with a bottle of Italian wine.
The location is excellent, just a couple of minutes' walk from St. Peter's Square. The apartment is located in the basement of the building, the basement has signs of moisture damage on the walls (but nothing in the apartment) and there is some humidity smell that reaches into the apartment (important note for sensitive people).
There is hot water but in the shower, the water fluctuates between cold and hot (in cycles of 20 seconds approx) even though the water is set to hot.
There is no WiFi and the reception in the apartment (for internet) is very poor, at least in our case.
Check out was flexible and smooth.