I and my wife stayed at Kristina's studio in the week before the X'mas of 2013. This place is lovely, pretty much as documented by Kristina.

The first striking view (that stays as a lasting memory) is that of the blue Pacific from the patio itself. The studio is ideal for a couple, neat & equipped with most amenities. The bed is comfortable, neatly tucked in a mosquito net. The kitchen is well equipped along with pans, dishes, cups and also some amount of seasoning. However it does lack a dishwasher (though that's not much of a hassle as one doesn't cook much on a vacation & also because Big Island has many restaurants one must try out). The closet space is a bit limited though. It also has a small TV screen with an inbuilt CD-player. Kristina has also stacked up a few classic movie CDs for the convenience of her guests. Not to mention the complete snorkeling gear she's stocked up very generously for free usage by her guests.
The bathroom is neat. Though one thing we missed therein was a counter-top for the wash basin.
There's a pebble beach at the end of the steep road which is a few minutes of driving distance from the studio. However as the tide was very high when we stayed, we did not use it.
As the location itself was a bit remote, we stocked up our supplies on day one & hence never faced an issue. Though remote, the location is still central w.r.t. the Volcanic National Park on one end & Big Islands' best beaches & Alii drive on the other. The Pu`uhonua O Hōnaunau National Park is not very far either.

Kristina is a great host and being a contributor to tourist books & magazines, she has some great tips regarding the to-do's & must-do's when on Big Island which she shares willingly. She's neatly documented & captured all these tips in a booklet that she places on the white desk in the studio :-).

Overall, I'd surely recommend the place to a couple seeking privacy & wanting to make the most of their Big Island stay.