The apartment is brand new, very clean, has beautiful interior and is very well equipped. It even has a washer-dryer and a dishwasher. It is located near Termini station (15-20 minutes to walk) as well as the subway station (5 minutes to walk). Therefore you can reach all the sightseeing spots in short time and you can even walk to the Colosseum (15 minutes). Supermarket and a really good restaurant (vecchia roma) are a 5 Minute walk away.
So for us it was the perfect balance of being near to the city center but not in a too "touristy" area.
Silvia is a great host, very friendly, fast in responding to messages and she gave us many helpful tipps to get around. We really enjoyed our stay and can totally recommend Silvias apartment.