We stayed at Mele's house for almost a month, and we had a great time. The place had everything we needed: enough room for us (2 adults and 2 kids), washer/dryer, lots of stuff in the kitchen and even in the fridge, an absolutely lovely lanai for morning coffee, board games for the kids, lots of beach stuff, good wifi, and an excellent TV with many streaming options.
The location was good too: 5 minutes away from a drinking water station, 15 minutes away from a grocery store, 30 minutes away from the National Park entrance, 60 minutes away from Mauna Kea Visitor Center, 30 minutes away from our daughter's favorite Carlsmith Beach Park in Hilo ("the turtle beach", as she named it).
I do want to warn about the rain -- it did rain pretty much all the time in Keaau/Hilo area, but sometimes it was very light, and sometimes it was quite heavy, so beware, if you're not into that.
We also could hear the neighbors upstairs, not because they were loud, but just because of the nature of the house/flooring/etc. But it did not bother us.
All in all, we had a great time! Thank you for having us!