It's a modern apartment that's ~10 min walk from the Ostiense station. From there you can access basically all the tourist attractions in Rome.
The neighborhood (Testaccio) is surrounded by amazing restaurants, cafes, and bars.
Paolo the host gave us some local recommendations and they all turned out to be great.
Having a washer and dryer in the unit was a blessing since we stayed for 2 weeks. I highly recommend booking Paolo's apartment if you need a place to use as a base for exploring the eternal city.