I'll post the link here then. As for how to tag this: maybe it is not necessary to show the shape of the stairs but just that there are stairs, it is only one level and not a full spiral. It connects the ground floor of Osquars Backe 5 (main entrance at the south end of the building) to the surface at the northern end. The ground floor extends to beyond the staircase. The whole well forms an open atrium to the studios below. I had this problem of ground floors turning underground floors elsewhere but didn't get suitable help in the forum and gave up on it.