Marii is an incredible host and her place is perfect. The room is spacious and has a private bathroom (although it is outside of the room). You are 3 mins walking to piazza navona, 10-15 mins to pantheon, Trevi fountain, and the Vatican, and 25 to coliseum.
Marii’s hospitality is great and she gave us some amazing local tips for food!
The one thing I would say is that the apartment is located directly above a bar and down the street from another bar, and we were kept awake by the noise on Saturday night fairly late. Sunday/Monday nights were not as loud, but we did get earplugs for the noise. I didn’t see this in any of the other reviews, so just be prepared if you’re a light sleeper!
I would 100% recommend Marii’s place to any couple or solo traveling to Rome!