Along with Harvest Homeand The House Next Door, this is one of the great pre-King (Stephen of course)haunted house stories. (And I love the fact that i was born the same year as these were published.) 
 For a book that's nearly 40 years old, it's dated very little - the pull of the dream house and the posessions within is a fairly timeless one. I love all the little touches - the 'calming' room (no valium required), the roof tiles flying upwards to fix themselves, and of course, the character whose hair goes white overnight. If I was to be really nit-picky, I'd say there's a bit of wicca-bashing going on, (as there is in Harvest Home), but really, it's so open to interpretation that it's really not a big deal. Forget House of Leaves; Burnt Offerings is the real deal.