What is the critical appreciation about the story "The Open Window" by Saki?

In his story "The Open Window," Saki characteristically
manipulates one trait of an individual:  Framton Nuttel's neuroses. In a rather
sophisticated way of using the frame story, Saki's ironic wit pokes fun of the
gullibility of Nuttel as well as his audience.  With the storyteller being a girl named
after truth--Vera--the reader and Nuttel both are unsuspecting victims of her practical
joke.  Added to the cleverness of using a girl as a narrator, Saki also deceives his
audience with descriptions such as this one:

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Here the child's voice lost its self-possessed
note and became falteringly human.  "Poor aunt always thinks that they will come back
someday...."

While his irony
is not bitter or cruel, it, nevertheless, conquers in the end.  Framton rushes from the
house in fear, and the aunt, Mrs. Stappleton, is deluded by Vera's explanation that
Framton ran out because of his horror of dogs since he was once charged by a pack of
dogs at a cemetery and had to spend the night in a newly dug
grave. 

In "The Open Window," Saki cleverly
pits imagination--"Romance at short notice was her speciality"--against reality
in triumph over both Framton and Mrs. Stappleton as well as the reader in a cleverly
written frame-within-a-frame short story.