The apartment is the nicest area. When I travel to Rome I always prefers staying here, it's quiet yet close to everything a visitor might need from the great city. There's a nice specialty coffee shop/breakfast place just round the corner, and it's still rare in Rome.
The apartment has several wow factors, starting from the ancient entrance (but keep in mind that you will have to bring your suitcases to the 3rd floor as there's no lift). However, the apartment is pretty dark. Even when it's shiny morning outside, you really can't tell when inside. Another thing that lacks at the apartment are the basic kitchen supplies like pepper/salt/olive oil. At the same time the kitchen is fully equipped. Overall, another great experience in Rome. Never disappointing!