I have to say, I was overall impressed by the experience and the accommodations. Federica was very helpful and kind with check-in and offering assistance, though honestly I didn't need anything. The place was immaculately clean. I was glad to have the several amenities, although the plugs for the iron and hairdryer strangely seemed only to fit the outlet in the laundry / powder room, but no big deal. I appreciated the extra linens and toiletries, with a nice touch of water and biscuits for the traveler desiring immediate refreshment. The clothing storage was also very good, with pant racks and hangers and drawers.
The master bathroom is very nice with a heated towel rack and a shower with multiple flow options (top, side, wand). The kitchen was complete, with a great refrigerator and half-sized dishwasher, but I didn't use them as I was eating out constantly. Several lovely eateries, cafes, bars, etc. in the area.
I stayed for two weeks at the beginning of September, so I got a sense of the rhythm of the area at that time. The location is ideal, less than a two minute walk from Piazza Trilussa. The square below can get noisy on weekend nights, but in the bedroom with all windows, doors, and shutters closed, this was not a problem for me. It might be if you are a very light sleeper, but not an issue on weekdays. Thoughtfully provided were earplugs that I didn't feel compelled to use.
The flat is up six flights of marble stairs, which is a charming workout as you view the square below, but something to keep in mind. Some neighbors smoke, which can be an issue flowing into the main door from the stairwell, but after briefly opening the windows this was not a problem. The veranda is really great. I wish I spent more time there, it's so pleasant in the evenings. Churchbells, sunset, and dinnertime chatter below make for a magical setting for dinner, drinks , or just unwinding outside.
It was about a 25min walk to the Pantheon, and similar to the Vatican. This side of the river was a bit quieter than the more trafficked area near the major sites, which gave it a slightly more residential feeling. Taxis can only be booked in advance or at a taxi stand, but luckily there is a taxi stand (otherwise rare) in nearby Trilussa that I used to depart for the airport. In all, I have 0 complaints and would happily return or recommend to others.