Really great spot to stay in Italy. Here is a non-biased pro and con list:
The pros:
Location: This is about as central as it gets. Literally 15 seconds to the Pantheon.
Host: Elisabeth was fantastic to deal with as was her sister who we met briefly. Amazing host and amazing communication.
Mattress and Bed: Incredibly comfortable and nice sized.
Living Room: Although not well decorated and a little run down, the room was big and spacious.
Privacy and Noise: there is no noise to speak of and complete privacy. Felt like our own little apartment
Views: Views are ridiculous. I made many friends jealous sending photos of the view.

Cons:
Balcony: The large balcony was lovely but didn't get sun. (March) It was chilly out most of the time so we never used it. There is a beautiful balcony outside the bedroom that is sun drenched all day but it is tiny tiny.
Bathroom: Extremely small. This isn't a complaint. We knew about it but just be forewarned.
Furniture: In the living room it's mostly run down. The ottoman should be replaced. Stained.
Overall a great stay with a communicative host, super fast wifi etc. but it wasn't spectacular.