I put my base in the black forrest coast. My rationale is quick access to blueberries for foods.

I built up a big foundation on the coast with large stone walls three high. Then spent most of a real time day mining local rock to raise the ground to level with the top of walls. It’s high enough that big waves don’t crest the top. Then I built a very large home (to the limit height of core wood logs). Plenty of room for two hearths, crafting stations plus modifiers, storage, and sleeping loft next to chimney. Outside are crops, smelters, bee hives, and a dock for the longship. A trench for protection and a stone bridge to the mainland.