Just - wow. We've traveled extensively with AirBNBs, and this is one of the best ever.
The terrace is the main sell - simply amazing views!! And there's a hot tub being installed in the near future! Otherwise, though the apartment is slightly on the small side, it has all the room my wife and I needed. Sofa and chair in den area is quite comfortable, kitchen is spacious and had everything we needed - good fridge with small freezer, microwave (no oven), conduction stove. Bedroom quite spacious with very comfortable bed, plenty of storage, plenty of outlets for charging. Bathroom also spacious with large shower and very good water pressure. Wifi worked great - router right near entrance. Both TVs are fine, particularly the one with Netflix in the bedroom, though we didn't watch much.
Complex is quite nice and felt quite safe. You go out main gate and large CONAD grocery store is about 100 feet to the right. Plenty of good access to public transportation - if staying 5 days or more, we recommend the unlimited 7-day pass for 24 euros per person - we were there 6 days and got our money's worth - even gets you down to Ostia waterfront.
Do watch out for Sundays - we got there 1 pm on a Sunday and it was CRAZY due to the weekly flea market.
Just across the river is Testaccio area, which is one of our favorite areas in Rome - highly recommend Pecorino restaurant - great food and value - 8 euros for liter of house red (excellent!) or white, and warn against the Trattoria Da Oio di Leonardo Starace - good atmosphere but mediocre food and portions, and at so-so prices.
We go to Rome often, and hope to return back to this apartment - it's truly awesome!