You really cannot do better than this. Location is fantastic, on a quiet side street near Termini. You can walk to almost all the major sites in Rome -- and for those that are a little farther, you're right around the corner from the subway.
Valeria was a fantastic host. The apartment is well appointed: great bathroom, comfy bed. Apartment is quite dark & quiet at night. Lots of great little touches that make this a wonderful value.