I have not reach the “Heist on the high castle” quest yet (I will have to continue my play-trough some time), so I can’t argue on its completion.
As for the rest, this is a text based game were everything is lay on your imagination with some description to help you in this process.
Of course, I guess a map will certainly help at some point, but I think that with the wright description it will not be a necessity.
As for castle’s style, I personally imagine it as medieval, but that’s all the power of a text based game, anyone can imagine it as see fit.