Thanks to everyone who has answered so far!
I still haven't gotten my dream neighbor landed in that location, and since there are very few other locations it can land, I'm starting to feel like this location isn't possible (since I should've gotten it by now, if it were possible). I'll explain why I think it isn't possible, in case it would be of use to anyone else who plans house locations.
This is the house location I wanted, again, displayed exactly in a grid. (Stuff like PWP placements and house locations are determined by an invisible in-game grid system.)
This is a different house location in my town, which is close to the cliff. I have highlighted in yellow squares what I believe to be the "clearance area" needed in order to have the front of a house this close to a river or cliff. The front of the house, I think, needs more space because of the doorway and the invisible space in front of the doorway. I have visited many, many dream towns, and looked at the pictures provided in this thread, and I have not found a house that doesn't meet this clearance area.
Back to the house location I want, you can see it doesn't meet the hypothesized clearance area because of a bend in the cliff nearby:
So I don't think the house location I wanted will work, and I'll have to find another decent house location, and might have to alter my plans a bit. Oh well!
Just thought I'd share in case it helps others out there who plan house locations, and also to give a chance to others to dis-prove my theory on the clearance area needed to have a house this close to a cliff or river. It's not a problem to have the front of a house close to a straight river or a straight cliff, but if the cliff/river bends too close to the house, it might cause a problem!