The apartment is located in the Trastevere, 10 minutes walk to the core of the neighbourhood. It has easy access to the tram and quite quick access from Fiumicino, either by train or by taxi.
The description of the apartment is quite accurate; it's a modern apartment inside of an old building and makes it a really cozy stay.
Note that there is only 1 bathroom for the 6 people that can be accommodated in the place, although one of the beds is quite small to share but you can always get some loving. Also, note that 2 people would sleep in the sofa bed, which is quite comfy, although you will be hearing the neighbours up from early hours in the morning (I'm sensing they can hear you too).
Other than that, Sara was great waiting for us to get there (which after 8pm she does for a nice fee of 20 euros) and she was really cool to keep our luggage until our late flight back.
There are plenty of amenities around (supermarkets, convenience stores, restaurants, bars, etc.) and you're only a few minutes away from the core of Trastevere and few stops away from Piazza Venezia.