Great location, basically next door to the Vatican. The apartment was also great. It was on the small side, but for two people it was perfect. The "bunk-beds" were awesome. My boyfriend and I are tall (he's 6'2"ish) and loved the fact that bed was really long (short beds have been a problem at previous airbnbs).
I have nothing negative to say, except that it was unfortunate that all the restaurants in the area were very tourist-y (high prices for cheaply made food) and we had to search elsewhere for more "authentic" italian cuisine.