Slept here for more than a week. No problems at all. Sure some traffic noise from the highway, and cars and buses etc + all the people coming/leaving the view point, but for the view and the convenient distance to the city it's a really great deal. The restrooms can be icky yes... I believe it's mostly the bus loads with the drunk party people that are leaving the huge messes but in the morning the cleaning personel does a good job and all the toilets look respectable again in terms of being able to use them (some "art" on the walls might still be left...).
Place: Vista Point San Francisco
Location: 37.83248, -122.47948