This is a very pleasant apartment in a great part of Rome, Testaccio. You are right above a great restaurant (Ai Cocci) and just a few steps from dozens of other excellent places, including the famous Felice and Pizzeria da Remo. The awesome Testaccio market is 3 minutes by foot, and there are both supermarkets and local fruit/vegetable markets also only seconds away. For a neighborhood, Testaccio is unbeatable.
The apartment is on the 1st (2nd American) floor, reachable by elevator or a flight of stairs. There is a large entranceway which doubles as the living room (table for 3, small couch, TV) and everything is attached to that. The "master" bedroom has an en-suite bathroom, the second queen-size bedroom is even larger and actually a bit nicer. There is a third bedroom which only has a single bed in it and no real clothing storage---would be good for a single child. A second shared bathroom, also good sized, and a small galley kitchen round things out. There is a small storage area off the kitchen which also has the clothes washer in it.
The apartment was recently renovated, although the layout was stretched a bit to include the third bedroom (rather than a larger living room), so things are modern. The living room and third bedroom have no natural light.
The apartment is managed by Lorenzo who is very pleasant, but because it's one of a set of apartments, it is not as well cared-for as if he was the owner. We had a broken clothes washer, broken chairs, and a lot of burnt-out light bulbs. Nothing that was really a big problem, and Lorenzo did make an effort to figure out what was broken. I am sure if there was something that really negatively affected the stay, that he would have made an effort to take care of things.
Someone else came to let us into the apartment, also a pleasant fellow, but who didn't really know much about how the apartment worked. We asked about the heating and he turned to the cleaning lady to ask her. Fortunately, the Internet worked and we were able to figure out the high-tech Wi-Fi thermostat and get the heat on... Anyway, if you do have any questions, make sure you get them answered.
The main bedrooms both look down on Luca della Robbia, which means that there will be noise at night to midnight as there are three restaurants with outdoor tables within earshot. The windows are modern, but there was still noise filtering in. If you are very sensitive to noise, either bring earplugs or choose a different location.
The kitchen is adequately equipped, but small so this is not a place to exercise your Italian cooking fantasties. We were able to make salads and snacks without any problem.
In general, the apartment is nice and serviceable. For a short stay of a week or less, this would be great for two couples or a family with children. (The beds can be split apart in at least one bedroom, maybe both).