Overall, very happy with our stay here.
Pros--amazing location! So close to Piazza Navona and the Pantheon, easy bus ride from the train station, close to a taxi pick-up location, lots of restaurants nearby. Also, groovy interior with old brick and arches. The AC helped cut the August heat. There are 2 queen beds in the back room with a separate entrance to the bathroom (so 2 different bathroom entrances) and you can close off the room from the main kitchen area where the third bed is located, so it gives some privacy for that room (we had 6 adults staying there).
Cons--beds were not comfortable at all and it could have been cleaner (urine smell in one back corner, floors kind of dirty).
Some reviews said it was noisy, we didn't notice that problem and were staying there in the height of August tourist season. Overall, I think the pros outweigh the cons, especially if they get new mattresses, and I would recommend staying here. You can't beat the location and cost!