Our family of 12 stayed at Heritage House this summer. The owner, John, was easy to work with and the house was great - photos don't do it justice. We found the place VERY CLEAN and well stocked. Perfect for extended family, each smaller group had their own apartment and could congregate in the lower level. 10 minute walk to the lake and the few restaurants in Fontana.
Only watch out would be that the stairs to the upper apartments are open and we had to be careful with our small children. On the other hand, there were multiple playgrounds within walking distance!
Hope to stay again next year.