I highly recommend this place for the following reasons:
1. Cleanliness - the place was spotless, not a spec of dust in sight (not even in more obscure spots, like behind the TV or above the picture frame).
2. Communication - as soon as I completed my reservation I was contacted by the host with instructions on how to find the place. During check-in and check-out the host was just as quick to respond. It's worth mentioning that the host's English was very clear, which is rarely the case in Italy; this will come in handy for tourists who would like some help planning their schedule.
3. Equipment and accessories - the room itself had everything I needed. The walls are covered in a foam-like material which is not only aesthetically pleasing, but also does a great job isolating noise (I couldn't hear anything from the other rooms in the apartment). There is a fully equipped and operable kitchen, which is great for people who enjoy cooking at home using store-bought Italian ingredients.
4. Location - my ideal B&B wouldn't be too close to the center (as those are significantly more expensive), and yet close to public transportation (so that you don't have to walk far). This apartment meets that balance very well; it's in a quiet residential area away from the city center, and also very close to tram and bus stations (about 4 minutes for me).
5. Helpfulness - beyond the clear communication mentioned before, the host was very kind and eager to recommend places to visit.
Long story short, on my next visit to Rome I know where I'll be staying.