I was staying in the apartment for one month. The place was exactly what I expected from the photos: It was very clean, friendly, bright, very well refurbished and not too small. Greta and her husband are very nice and helpful people, I cannot think of better hosts.
The neighborhood is a non touristic area which I enjoyed very much: There are plenty of bars and restaurants where you can have your typical Italian breakfast (cappuccino e cornetto alla crema), a Spritz and good Italian food. Nearby at the station Pigneto (only a short walk or one station to ride with the subway) you can find many more good options to eat or to drink.
The place is also well connected: You can take the subway C from the station Malatesta which brings you to the center.
Overall it was a very good experience and I will surely return if I come back to Rome.