Upvote:2
Within the scope of artistic licence it seems to be fairly close to what Roman York is believed to have looked like. Given that Vikings didn't have a reputation for being much in the way of civil engineers it's probably reasonable to assume that Jorvik had much the same layout as the Roman and subsequent Anglo-Saxon versions.
That being said, "accuracy" of city maps from the Dark Ages is going to be iffy at the best of times...