These things are rather subjective don't you think? Where does the center end and the North start? I guess it depends what you are used to. Similarly with East-Central-West. Whenever people use terms like "Central Europe" they may refer to a geographic center (Poland, Czech Republic, I put the Baltics in the same category because they are in the same region - what do I mean? For example there is a sea between the Baltics and the Nordic countries,however culturally I'm told the Baltics have much more in common with the Nordics), they may refer to the EU, the center being probably around Austria, or I even heard people consider Center to be West part of Germany, because Europe they know ended at an Iron Curtain in Berlin.

Northern Europe usually refers to Norway, Sweden, Finland, and sometimes Denmark. But they are further north than most of the other countries people think of as "eastern", that is true.