Depends on what you consider the dividing line between C and D climate types. If it is set at -3 °C as is usually done in Europe, it's Oceanic (Cfb). If the much more sensible 0 °C dividing line (which is preferred in the US) is used, it's Humid Continental (Dfb).
Has anyone every stopped to consider that there is probably a strong bias toward European climate types under the Koppen system?
Considering that under this system (especially if the dividing line preferred in Europe is used) most of Europe is classified under the same climate type (Cfb), not really.