This a very well located apartment in the Testaccio area.
The apartment is spotlessly clean. The two main bedrooms are spacious and airy with lovely high ceilings. One of them has an ensuite with a serious power shower. There is also a separate bathroom off the dining area with, again, an excellent shower. The beds are very comfortable. There is a third bedroom that we didn't need that has a sofa-bed.
There's a small but perfectly functional kitchen and an adjoining dining/sitting room, with a dining table and a two-seater couch for TV-watching. It's fine but not a space that can comfortably be shared by more than three people. There's a good smart TV with Netflix, Spotify etc.
On the downside, it's a city apartment so it can be very noisy at night. We closed the windows in our bedroom to dampen down the noise.
What's good about the area? The Tiber is only a 10 min walk away. It's a mightily impressive river that's like the spine of the city. There's a superb walkway/cycleway along the river. You can walk to Castel Sant Angelo near the Vatican in about 40 mins.
Second, there's excellent public transport nearby. Pyramide metro station is a 10 minute walk (turn left out of apartment and left again. Then turn right onto the busy Marmorata road which leads Pyramide further along). There, you can buy a 24-hour travel card for just 7 euro (all bus and metro routes). Just beyond Pyramide is Ostiense railway station from where Fiumicino airport is just half an hour away (8 euro).
Crossing over Marmorata instead of walking along it takes you up onto the Via di Porta Lavenale and then onto Via Santa Marina Sabina on which you'll find a great viewing spot over the city. Keep walking and in a few more minutes you'll drop down into an area beside the Tiber where there's a famous Santa Maria de Cosmedin
church.
There are loads of restaurants nearby including Al Cocci literally next door with its friendly staff and good-value food. Very close too are two very popular spots (where advance booking is a must): Felice and La Franschetti di Mastro Giorgio. We were turned away from both on a Tuesday night as we didn't have a booking but they looked like good spots, particularly Franschetti.