This apartment is excellent, clean, modern, and in a wonderful location. From here, you can literally walk downstairs for some of the best food I ate while in Rome. Un Angolo di Sicilia and Osteria Scaloni are both excellent. Pippo Bar has great coffee and pastries.
There is also a mercato, across the street next to the Technology Museum, which has fresh produce, great breads, cheeses, etc. You are also less than ten minutes from the bus station Clodio where many buses stop.
Also, the kitchen is stocked very well and is easy to use. It is a comfortable apartment with plenty of chairs and the dining table seats six. The bedrooms and bath are spacious with plenty of closet space. It is a very safe neighborhood, based on my experience.
Two things to note - the air conditioning is not central (as is the case with most Italian apartments), it is just in the bedrooms. In the heat of July it can be quite hot, which is not a big deal if you wont be home during the day, but if you plan to work, cook or relax in the living space during the day it is quite hot in the summer months. Also worth noting, as far as how apartments are listed in the US, this would be considered the 4th or 5th floor, not the third, (there is a terrace apartment and three other levels below) and there are two flights of steps per floor. So, if you have trouble walking up steps, such as bad knees, or if you have small children, just know it is quite a lot of stairs. Overall, those two small matters would not stop me from renting this apartment again. Carlo was an excellent host, quick to respond to my few questions and very thoughtful. He left us fruit and pasta, snacks, water and wine to get us started. Excellent value.