I would have given her 6 stars, too bad there’s no such option.
1) The location is superb - 2 minutes walk to Piazza Navona. The area is so cool especially for the millennials - so many good bars, great restaurants and cool shops nearby.
2) Marii is an amazing host - very clear communication, extremely helpful (she arranged for transportation from the airport at short notice), very generous (I got cherries, tiramisu, chocolates throughout my stay).
3) The room is comfortable, nicely decorated, high-ceilinged and well equipped.