Hi,
(First post)
As other members have pointed out there are some online resources for historical Nordic maps.
And the websites are not always that easy to navigate.
Anyway, here is a historical (1846) map of Stockholm, should you desire to bring your characters and väsens there...
https://sok.riksarkivet.se/bildvisning/K0037670_00001
I am always looking for more nice maps, so please continue posting links in this forum in case you find any useful ones.