No need to get snarky

. After all, the nation state is a modern concept. And Bohemia wasn't part of the Habsburg territories in the Middle Ages, but it was always part of the Holy Roman Empire, unlike other parts of the later Habsburg territories.
Edit: This doesn't really touch on the question what kind of people lived in Bohemia. Although the number of Germans in Bohemia was quite large at the end of the Middle Ages, most people were Czech. Most of the time, the kings were Czech, too. When Karel IV. (from Luxembourg) was king (and Emperor), he insisted that the children of Germans in Bohemia learned Czech. The situation worsened later, during the Hussite wars. The Middle Ages were no times for nationalisms.