So many great things about Graham Hill. As others have shared, the apt has an excellent view of Mt Ranier - so inspiring. The neighborhood is so peaceful. It's a fantastic place for short walks or as a staging point for hours long walks down to and around Lake Washington. And, ample parking and outdoor space is available.
John has also done a nice job of adding amenities: a sleep number bed, multiple tvs with cable, etc, a keurig, cereal, etc.
I'd only note that it is somewhere between a private apartment and shared space. Don't get me wrong, you have a separate entrance. But, there is a door connecting it to the main house that only locks from John's side (not that John would ever come in without permission but it felt less separate than I expected). The kitchenette has only a mini-fridge and microwave. Perfect if you're eating out a lot (which I was) but challenging if you'd planned on cooking meals (which I didn't).
If neither of those things is a problem for you, I'd highly recommend Graham Hill.