Robyn's has a pretty distinctive Stockholm accent when she sings or speaks I think... I think it is that girly voice that makes it sound a bit unique and urban as you say. She is doing a free web concert where you can give requests for her to sing, talk to others that are watching, talk to her, etc. on Aug 24th. You just book your tickets here :
http://livelopet.aftonbladet.se/#