This apartment is amazing. The location cannot be beat - it's in the middle of everything (less than 5 min walk to Piazza Navona and Campo de' Fiori; 15 min walk to Trevi Fountain and 20 to Spanish Steps; 15 min walk to St Peter's; 25 min to the Colosseum). Lots of great restaurants are just outside the door and there are several grocery stores nearby (one is just down the street).
The apartment itself is spacious and filled with amazing natural light. Everything feels clean and like new. And the AC - if you're traveling in summer - works really well. The apartment was definitely a haven after long days of sightseeing. As the listing suggests, you will have to walk up stairs to get to the apartment, but Lorenzo is there to help with luggage when you arrive and when you leave. Because the apartment is in such a great central location, if you're sensitive to noise at night, you might want to bring earplugs.
Finally --- Lorenzo is a fantastic host. He is super responsive and accommodating. He helped us arrange our transfer out of Rome (which was a competitive price in a very nice and clean car with a great driver - the best transfer we used during our trip in Europe!). Definitely don't hesitate to book Lorenzo's place. We'll be staying here again next time we're in Rome.