This is a great place. We were a family of 5 (which included 3 teenagers) we took a taxi from Fiumicino airport (cost around €50) and the journey took around 40 minutes. There is also a terravision bus (journey 1 hour) or train (journey 30 minutes) to Termini station and then either a 15 minute walk or metro 1 stop to Cavour just around the corner from the apartment.
We were greeted at the apartment by Chiara's husband, who was lovely and showed us around and how to link up to wifi, which worked really well.
For those less able bodied or bringing a lot of luggage - the apartment is on the 4th floor and has a fairly steep winding staircase.
The apartment is fantastic, it feels light, modern and airy and has a great lay out. There is a lovely terrace leading from the well equipped kitchen where we sat and ate breakfast. Everything was very clean.
It is also in a superb area, not only can see the Colosseum at the end of the road, the surrounding streets are lovely everything from a great Brazilian/Japanese restaurant to vintage shops.
We cannot wait to come back and it will definitely be to here.
(also took a great "TopBike" bike tour around Rome on the 1st day which was a 15 minute walk away)