Pros: Great location, near the Castel Sant'Angelo, Piazza Navona, Pantheon without being so close to having a lot of noise. Quiet at night. Nearby taxi stop. Good linens. Very good host, helping us carry bags, explaining items in the apartment, teaching us to make Italian coffee, very responsive to texts. Fixed a plumbing problem from prior renters within hours of our checking in (on a holiday weekend). Rooftop terrace nice.
Cons: Showers drain very slowly. Effectively, you are forced to shower in stages, turning off the water as you go to allow some water to drain before continuing your shower.
Neutral: Great to have a washing machine for clothes (no dryer, typical in Europe), but no operating instructions. Lots of stairs to climb, but worth it for the view.