Great place, very nice host. The apartment is large, with a well-equipped kitchen. Location is super - 2 blocks from the coastline, and super-quiet at night, with just a chorus of the local frogs (we slept incredibly well). Maria was incredibly accommodating and considerate-she really took care of us, even though we were there for only one night. She also has lots of equipment/gear readily available for guests, including snorkel equipment, beach chairs, a cooler, etc.
On our next trip, we will spend at least a week in Hilo. The hiking in the area is great (waterfalls, amazing groves, etc.) - much better in many ways than Kona, since millenia of rain and heavy plant growth have filled in a lot of the lava (which is very rough and impossible to bushwhack on the Kona side). The botanical gardens are amazing, and the local food is great and reasonably priced. Definitely get the kamboucha (and food) at Conscious Culture in DT Hilo.