The apartment was great, just as advertised. We were too many people for it (8, including the 2 year old), but it was comfortable enough and well-furnished, with the washer and dryer being very useful. It even included small things which you always miss, such as water in the fridge, salt, and coffee.
Everything was clean and in great shape.
The apartment is well situated, very close to the Fontana di Trevi and Spanish steps, and we got everywhere by foot.
Alessandra as a host was wonderful, and even helped us with transportation from the rental car drop-off to the apartment and from it to the airport, at a fair price. Having a courteous driver wait for you is no small matter when traveling with so many people, kids, and a few tons of luggage.