Pembo, my daughter went for two weeks, when she was 7. She had a wonderful experience, and this year will be her third summer.
This is a very small camp, with a low camper/counselor ratio and I think I'd take that into consideration, for a younger child. DD had 3 other campers in her group, and one counselor, so they each got a lot of individual attention.
If you are worried, but you have the option of starting out with 3 nights, and your child is willing, you could try that and see how it goes, and then maybe do the week long camp next year.