Damiano's apartment is just south of Testaccio, a beautiful nontouristy suburb outside the historic center. It takes around 15 minutes at a stroll to get to metro stops or bus stops, and another 15-25 minutes from their to where you want to go. The trip, however, may be delayed by forays into the scenic alleyways, or unexpected pitstops at cafes, pizzerias and cafeterias. The food in the neighborhood is spectacularly good, much better than what you find in the center.
Damiano does not live at the apartment, but almost every evening he stopped by to restock, deliver fruit, desserts and snacks (complementary!) and chat with us or the other guests. There are three rooms, so you will share the space with other guests. He was kind, flexible and helpful, and full of wonderful stories. Ask him about the movie The Young Pope. He had a speaking role in it!
The entire apartment was immaculate. I once dropped a piece of pear under the oven, and when I ducked down to find it I noticed that even this space was completely clean and free of dust! The room was decorated with art painted by Damiano's father as well as a rather striking portrait of a young woman that took up an entire wall. Clean doesn't quite describe how spotless this place was.
I couldn't find fault with this experience. I give a massive recommendation. Have a wonderful visit.