We had a good stay at Via del Governo Vecchio 34, which was only a very short walk from the actual Piazza Navona.
The apartment was large, with attractive wooden floors throughout. The main bedroom was spacious with lots of places to hang clothes, etc. The bathroom was also a good size. The second bedroom was smaller, and the bathroom was a short distance from the room itself. The dining room and separate lounge were also spacious and we enjoyed using both. The kitchen was a reasonable size, and much more than adequate, given that we only really used it for breakfast.
We did have some issues, that arose because the apartment had not be used for some time due to COVID, but Andreas was always available and more than ready and willing to resolve the difficulties.
The apartment is located in the middle of all the places we planned to go to in Rome. All within easy walking distance, some just around the corner, others no more than 10 - 15 easy ambling minutes walking away.
We would recommend it and Andreas to you.