The Hamakua Guesthouse is located about 15 mins north of Hilo town. It was very easy to find by using the detailed instructions given to us by Mathew (point of contact). It is near Akaka Falls just not as far up the mountain.
The house itself was fairly small (3 adults/3 kids) but we were still very comfortable for our one night stay. There are no bedrooms, there is a loft with 2 twin bds. the living room has a comfortable couch and right off to the side is a king size (I think) bed. Also there is a small couch in the kitchen/dining area.
There are 2 swimming areas, one being a smaller pond and the other is the large waterfall. This was best part of the location, you have a beautiful water fall on site that you don't need to hike up to. The kids loved it and swam very easily in it. Just be mindful of heavy rain... regardless of your location flash flooding does happen.
We would definitely stay here again.
Pros:
location (15 mins from Hilo/ 45 mins from Kilauea)
Nice and secluded
Waterfall
Sound of nature
Cozy living
Cons;
Bring mosquito repellent and punk
no microwave (due to solar)