My partner and I stayed in Haunani House for a month, and it was the perfect homey getaway to work from home and stay distant. It's secluded, but the little town of Volcano and the national park are both extremely close. Note that if you're hoping to do a lot of exploring in other parts of the island that the drive to Hilo is 40 minutes and to Kona is 2 hours.
For others looking to work remote from here, the wifi was spectacular. Zero issues with internet connectivity, and I'm regularly on video zoom calls for work. I was nervous about this and didn't see many reviews that mentioned it, so I'm here to tell you that you don't have to worry, this was better wifi than I have at home. :)
Todd was extremely responsive and gave us great tips for the national park. Perfect host!