Now the first 4 days are over and in my opinion we've managed more than I was hoping for. We removed the carpet from the living room downstairs, the staircase and 2 bedrooms upstairs, removed the wood panelling in the living room, kitchen and one bedroom, opened again inbetween the kitchen and living room, removed the wallpaper Ingólfur chose when he was 6 years old (sorry about that) and threw away a bunch of furniture, which wasn't any use anymore.
Ingólfur started to take down the old kitchen his dad built himself. Not easy to do so as at the time it was built (around 1963) chipboards weren't easy to get and expensive. So he made all the boards himself with 2 layers of a very thin, but strong material and strips of wood inbetween. Of course he used a lot of glue and he was able to hide the screws in the boards making it impossible to screw things apart. Well, the sledgehammer came in very useful...