We are a family of three (husband, wife & 15 year old son) and stayed here for 8 days. The apartment is literally steps away from the Pantheon and Piazza della Rotonda. It's on the third floor and is accessible using stairs (no elevator). The two bedrooms are spacious and the kitchen area is perfect for a morning coffee and a light meal. We never felt cramped.
A pocket door separates the shower, bidet and toilet area from the sink which makes sharing the bathroom with someone else much easier. Each bedroom has it's own TV and A/C units.
The kitchen was stocked with plates, coffee mugs, some silverware, a Bialetti moka express maker, oil and vinegar. The refrigerator is big enough to hold just about anything. We used it for storing milk, yogurt, fruit, etc. We used the gas stove to make our Bialetti morning coffee.
The washing machine is a bit small but incredibly handy. There is a drying rack (no drying machine) and detergent is provided.
The location is perfect for walking just about anywhere in the city. When taking a bus, most buses stop at Largo di Torre Argentina, Via del Corso or Corso del Rinascimento (near Piazza Navona). All three stops are no more than a 5 minute walk from the apartment. We used the bus system extensively and found it incredibly easy.
All in all, this is a wonderful unit for a stay in Rome. I would absolutely stay here again. The location and amenities inside were exactly what we wanted.