My wife, my daughers (1y & 3y) and I stayed at a Nou Fontana apartment in early Oct. 08. We had a lovely time. The apartment is very near to the child-friendly Arenal (sand)beach/boulevard with many restaurants and bars.
Our apartment was nicely furnished with all the equipment (dishwasher, washing machine, TV etc.) you need. Chris, the apartment manager, was a big help. You need a high seat, travel cot, stair gate and some groceries? No problem for Chris.
The Nou fontana complex has a beautiful garden with a big (unheated!) pool. Unfortunately in october the water was a bit too cold.
Javea and neighbouring towns Denia and Moraira are very nice. Approx. an hour from Javea are Alicante, Benidorm and Valencia.
In October the big crowds have left Javea but the summer hasn't. I would certainly recommend Nou Fontana and Javea if you are looking for a relaxed summer holiday in the autumn.