This apartment worked really well for us (my husband and myself, and our 25-year old son for the first two nights). Monica was very conscientious in accommodating our arrival time and contacted us ahead of time to confirm. The apartment matches the description exactly; it's very well designed with a loft (a queen-size bed) and a sofa bed in the living room, and an efficient kitchen (we cooked breakfasts) and bathroom and laundry room. There is also air conditioning, which is great for the summer months.
Monica provided a good map and several guidebooks to Rome, as well as directions to grocery stores and to good neighborhood restaurants. She also kindly booked a taxi back to the airport for us.
The neighborhood is great: it's walking distance from everything but not right in the congested tourist areas. There is a great bar (for cappuccinos and espressos, etc.) right next door, as well as a really good gelateria. There are good little shops on Via dei Serpenti as well as on the next street, Via del Boschetto.
We highly recommended this apartment and would definitely stay there again. The whole experience was great!