Actually the Nob Hill area is more of a wealthy name for the area by the people who wish it were Nob Hill...personally, I think the area should be more known for its historical district name, which is the Alphabet District which would make more sense and has a much more unique sound to it.
Alphabet District Map
The whole region in itself is called the Northwest District.
Actually a friend of mine likes to joke, only "nobs" call it "nob hill." I wont call it Nob Hill because there is no hill, in SF, Nob Hill is a hill. In Portland, that part of town is at the base of the West Hills. Hell calling it Lower West Hills would make more sense that Nob Hill....sorry, always been one of my big grips. Of course sames goes for how Couch and Williamette is both pronounced. It makes no sense.
Great shots by the way, seems like you had an enjoyable tourist visit to the city, and yeah back in the day Burnside to Jefferson and the river to the 405 was considered downtown, but these days it is more like a collection of districts that are within the 405 loop and the river as all of downtown. Of course, the official downtown map is much larger and includes the eastside as well, but your average person would have no clue about that.
I am not gonna say anything about Blue Bottle because I have never had it, but Stumptown for me is the greatest coffee I have ever had and by far a perfect staple for Portland.