Act I Scene VI What is King Duncan’s impression ofMacbeth’s castle? What makes this view ironic?

As Duncan enters Macbeth's castle he says that he feels the castle and the air to be gentle and pleasant,

This castle hath a pleasant seat; the air

Nimbly and sweetly recommends itself

Unto our gentle senses.

The dramatic irony here is that Macbeth and his wife plan to kill Duncan that night