Answer:
The example of metonymy in story is when the narrator uses the phrase 'the great hallows' to link with the presence of entities in the house.
The personification is used when the narrator implied that it was the house that kept them from marrying.
Explanation:
'House Taken Over' is a short story written by Julio Cortazar. The story is about siblings, in their forties, living in their ancestral house. They are unmarried, sister, Irene, turned down two offers while brother's, the narrator, financee died.
Metonymy is a device used to link the concept with it's object. For example, in metonymy 'The pen is mightier than sword', 'pen' is used as a concept to link with it's object, that is words.
In the short story, the author used metonymy of 'the great hallows' to link the concept of presence of certain entitiies in the house. The great hallows is a place filled with curses and great enemies. Thus, by using the phrase 'commune with the great hollow,...' the narrator is indicating about the presence of entities.
Personification is a device used to personify non-living object with human characteristics. The example of personification used by author is when he stated that 'Sometimes we came to believe that it was she who did not let us get married.' In this line, 'she' is used to personify the house.