This was a wonderful apartment for a 4-night stay for our family of 5.
The location is ideal for exploring Rome's main sights on foot (the Spanish Steps are just a couple of minutes away). We found it a very walkable city. Most of the streets (with the exception of a few main thoroughfares) are semi-pedestrianised, including the street where the apartment is located. So we had a very quiet place to rest up.
The apartment itself has a nice amount of space for 5 people, comfortable beds and furniture, and plenty of character. There's a decent mini supermarket nearby so it was easy to self-cater when we wanted to.
The hosts were really friendly and helpful. They arranged taxis to and from the airport and were fine with us checking in late in the evening. They have excellent English but were also polite enough to suffer my attempts to communicate in Italian!
Highly recommended!