i have done some investigation on the location of things in the vn compared to irl (screenshotting backgrounds and google reverse searching) and with the help of some dialogue and context clues, i believe dawn chorus takes place somewhere in the outskirts of Tromsø (most probably somewhere on the island of Kvaløya because that way the guesthouse would have a view of the city and the sea, as is implied in some dialogue) I don't know if there IS a real guesthouse on the real island but i presume it must be inspired by something similar somewhere nearby-
it doesn't really seem like there is any directly in kvalöya, and i think the name of it is morgensong (björn said so in the game). i think we mostly need the creator of dawn chorus to tell us if there is one or not ;-;
https://www.google.com/maps/search/guesthouse/@69.6553225,18.3375895,10z/data=!3...
to be fair i don't really expect there to be a physical real inspiration, almost all of the real places (or their analogues) depicted in game use real photos as background, while the guesthouse almost exclusively uses cg renders.
and on that note geographical accuracy isn't really given much importance (which is fine), just look at rune's tea house, for which the exterior is an irl gay bar in iceland, but the inside uses images from a tea place in poland- or the philharmonic which doesn't look like the one in tromsø but is a perfect match to the national forum of music in Wrocław