My mom and I, we spent 4 days at Luigi's apartment. Luigi was extremely helpful, he met us in the apartment with fruits and cake, showed us nice places in the neighborhood, helped with a local phone number. The place is nice, very clean, with everything you need during the stay. It's very easy to get to all famous places. Piazza del Popolo is in 15 minutes by foot and you can take a tram. It's easy to visit Vatican - a short nice walk across Tiber and a bus takes you directly to the place.
I recommend this apartment without any doubts.