We were a family (with 2 kids: 10 and 16). The apartment was not very big, but enough place for all of us. However, for us the highlight was a small garden and Jacuzzi - nothing could be better like to cool down in the middle of the day in the pool when outside temperature in Athens is above 30 degrees C :-)
We also liked the neighborhood: lively, interesting district with plenty of bars, taverns, restaurants just few steps from apartment. However, the apartment wasn't noisy and we could rest very well.
Overall - highly recommended.