Great food? Maybe. But it has to be local, lest it spoil.
A castle? Maybe, but it would probably be cold and drafty.
Other than that you couldn't pay me $400 billion to live in the 14th century.
I'd rather have 400 million in 2012.
To add to that, I’d rather be a welfare recipient in America 2012, than be the richest man in history in 1331.
The ancient Romans had answers to cold and drafty castles, ranging from the hypocaust (a furnace beneath the castle floor) to concubines.
The biggest thing medieval kings didn’t have was modern medical and hygienic knowledge. If I could somehow ensure that I was never going to get sick, I’d go for it.