Our stay at the apartment in Testaccio was wonderful! The apartment was spotless and was perfect for our family - we traveled with 6 adults and 2 children. Kitchen was well appointed with utensils and supplies and very clean. Baths and bedrooms were roomy as well and linens were crisp and fresh. Emiliano was wonderful and very responsive to our needs- we even accidentally locked our keys in the apartment one day and within 40 minutes he was there to unlock the door for us.
The neighborhood is not too "touristy". Many good restaurants (Pizzeria Remo, Il Bucatino were two recommended by locals and very good), public transportation, grocery stores, and markets are within walking distance.
We highly recommend getting the driver to and from the airport - they were very prompt and so convenient. Highly, highly recommend staying at this location for your Roman holiday. A+++