Great place to stay if you want to explore Rome from a local prospective.
The flat is very nice and Maria Augusta is great if you need anything.
You will find all the amenities you would need if you were living in Rome, we felt to be at home more that on holidays.
Testaccio neighborhood is a classical area, you can find a lot of tipical take aways, restaurants and supermarkets, for a proper roman experience.
The transport connection is great, especially regarding buses.
Roma Ostiense train station just 10 minutes away.
Very recommended if you want to feel like a local, and explore the city from a great position.