Notice the square brackets around the curly ones. You have a reference to an array, not a reference to hash. The first (and only) element of the array is a reference to a hash, so:

print($result->[0]{'city'}, "\n");
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or

foreach $record (@$result) {
   foreach $field (keys %$record) {
      printf("%s: %s\n",
         $field,
         $record->{$field},
      );
   }
   print("\n");
}
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