We loved our stay at Hahei. The house is in a great spot, a few minutes walk to the beach and brewery (great Pilsner and food). Very comfortable house, great beds, comfy couches, well appointed kitchen, great TV. We especially loved eating dinner outside at dusk.
The only downsides were the very small laundry/bathroom (just part of being in a smaller beach shack though), no hand towel provided, no beach towels provided and no fans in the bedrooms. This was only an issue however for our kids napping in the bedrooms during the day which did become very hot.
Another thing to note for parents of little kids, is that the property is not fenced (nor are other properties in the area). This was only an issue for us as our toddler is a runner. No fault of the host or listing, just something to be cautious of with little kids.