Hilary's place is comfortable, private, and beautifully tranquil. And she's a very responsive, attentive host. I was looking for something different than my standard AirBnb in Palo Alto, and definitely found it.
The drive to Portola Valley isn't for everyone (it feels remote, compared to the hustle-and-bustle of Silicon Valley!) and I wouldn't recommend arriving at night after a long day at work (it's very dark, with lots of windy roads!). But I would stay here again, especially if visiting the area for vacation.