Excellent central location, within walking distance (if you like to walk) of all the major sites, Piazza Navona, Pantheon, Vatican, Colosseum, Piazza del Popolo, Borghese Gallery, Jewish Ghetto and Trastevere.
Sitting on the balcony overlooking always active Campo dei Fiori was a treat. And closing the window and door to the balcony resulted in almost total silence for a good night's sleep.
We did not meet Sonia, but Bruno met us at the door for our orientation to the apartment. Sonia conveniently arranged for transportation to and from the airport at a cost just slightly higher than the standard taxi fare and she was in frequent communication by email/text throughout our stay.
While not as luxurious as the photos would suggest, this is an excellent choice for location, value and hospitality.