I know about the lives of royals and aristocrats who ruled over vast swaths of land, but this was fairly rare. Most nobles could never afford a massive stone castle and wouldn't even dream of engaging in diplomacy with a foreign ruler. What would my day to day life be like if I were a vassal who ruled over about 300 people? What kind of house would I have? What would I wear? Who would I marry? What would my finances be like? I'm particularly interested in the High Middle Ages, but any insight would be highly appreciated.
About a year ago I wrote a short answer on what crisis management in the event of crop failure might look. I answered the question in two parts, and the second part was a little vignette on what the economy might look like in a 13th century seaside village from the perspective of the local vavasour. While it isn't a fully conclusive or definitive answer, you might be interested in reading it: the link is here.