As everyone has said, the location of this place is incredible and in the center of everywhere notable you'd want to go.
Roma Termini is just a little over 20 minute walk, but the route provided by Google maps was a very straightforward walk when we first arrived. We met with a contact waiting outside the apartment and he showed us up. For check out, we simply left the keys on the table and closed the door behind us.
The entire area of this Airbnb is a huge tourist spot with bustling crowds, and gelaterias and trattorias at every corner. There's plenty of restaurants to try out or order for take out, and the Trevi Fountain which is a hugely popular location for some reason, is literally 30 seconds walk straight down the street.
We loved coming out of the building and entering a lively road, and when returning, disappearing from the noise into the quiet apartment. All the landmarks like Colosseum, Tiber River, Quartiere Coppedè region is all within a nice 20 min walk.
The apartment had all the essentials including WiFi, a kitchen, and even a washer with tidepods and an outdoor area to hang clothes.
We were spending half of our day working and being in video calls, so I was glad to discover the wifi here is very good at 80mbps average, which was more than enough. In fact, the highest we found on our entire Italy trip.
The only gripes we had was our towels had a funny smell, as though they were wet and didn't dry completely before being put away. In addition to that, the shower was kind of uncomfortable to use. There is no curtain, but a sheet of clear plastic covering half the bathtub from splashing the rest of the bathroom.
Also, the apartment is on the 4th floor so you'll probably want the elevator. Just a heads up, the elevator is a very tight squeeze, fitting only 2 people at most. If you are a larger party or with a lot of luggage, you will need multiple trips.
Overall, we had an incredible time here at this very convenient apartment and would stay again.