Great place to stay. We would definitely come back.
The apartment is very large - larger than it looks in the pictures. Two bathrooms, one with shower. Could easily host 4-6 people if more beds were installed. Includes a very nice private terrace with direct sunlight from late morning to noon.
The location is very close to Colosseum and a nice distance to all other tourist areas (like Vatican, Pantheon, etc).
Close by is the Trastevere area. It's a very active night party area so definitely go if that is your mood, but very touristic so the food quality is only so-so.
If you are looking for excellent food experiences, go 20min to the south-west to the Testaccio area. We recommend the restaurant Piatto Romano - their pasta is really world-class and the restaurant is very unpretentious.