Thank you for your comment. Yes, most of them are huge, covering the whole wall. Since the inner city (also the historic part of town) it is easy walkable. At the same time you do a historic walk, you will come across many, many murals as well. You do not need to do a street art tour first and doing the historic later. They can be combined.

Yes, once graffitti was considered vandalism. To day is popular. Now you can do guided walking tours in most cities just to see street art. The way we look at it has certainly changed.

I am originally Danish. Born and raised just outside Aalborg, but living in Norway. But I often go there to visit family. If you haven't been there, maybe it is time :) It is a small country, travelling is easy. Hope you do some day.