This 2 bedroom apartment on the first floor (one above ground level, with no lift) was perfect for our stay in Rome. The beds were large and comfortable, the two 3/4 baths served our group of 4 adults easily, and the well equipped kitchen worked well for making meals. The fridge/freezer was a good size, though we had to supplement it with an ice cube tray. We also had to provide dishwasher tablets and rinse, laundry detergent and string up a clothesline as there's no dryer or outside clothesline. We also had to augment the toilet paper supply, but these are minor nits.
The 3 air conditioning units were extremely quiet and very effective. The window shutters did a great job of darkening the bedrooms, too.
The only negative thing is that while the double pane windows reduce the outside noise dramatically, they don't quite seem to do it enough for us. There's quite a bit of random noise from people, cars and motorcycles and other vehicles at all hours of the night, so if you're a light sleeper then ear plugs are advised.
Regardless, this is a great place that is close to many of the main tourist attractions, close to several grocery stores and many excellent restaurants, and within walking distance of the Rome Termini station.