Maria's place was great. The location was awesome, being right across the street from the Pantheon. In one day, we were able to see the Piazza Novia, Spanish steps, Trevi fountain, and Villa Borghese gardens, all with a 2 year old and 4 year old in tow! There were great restaurants, gelato places, and coffee shops within a couple of minutes walk.
The space was more than adequate for our purposes. The sitting area was well segregated from the bedrooms so we didn't have to worry about waking the kids when we stayed up at night. Furniture and amenities were great; it had everything we needed.
A few things to note about the apartment is you have to go up three flights of steep, winding stairs to get to it. Also, one of the showers is pretty tiny. All around a fantastic place, especially for the price!