We stayed for 6 nights and we loved it. The location was really ideal. Literally steps outside the door there was everything you need from restaurants, bars, gelato shops, grocery store, taxi stand, Piazza Navona just around the corner. We loved being in the heart of it all, and it was a perfect location for walking to really anything you want to go see.
An important feature for me is comfortable beds, and these were very comfortable, about the size of American queen-size mattresses, and they provided a variety of pillows to choose from. Just due to space constraints in the laundry closet, the water heater is small, so a family of three or four would probably need to coordinate showering mornings/nights to have enough hot water. The washing machine works well but does not include a drying function, but there is a drying rack to utilize and plenty of clothes hangers.
The apartment was super clean and roomy enough to spread out. Also, it was very quiet despite being so close to a lot of activity outside. Never had a problem being awoken by noise. We would not hesitate to stay here again. Wonderful location!