The Miller Tree Inn is a bed and breakfast in Forks that claims to be the real Cullens household. In looking around Forks, there are very few other houses that could possibly fit the description, so this is as good a bet as any. If you decide to spend the night, ask for Bella's Suite that has red and black bedding decor and roses.
"Walk up to the porch and see the white board that the house owners update daily with Edward and Bella's whereabouts. When we were there, the sign read: The Cullen family (and Bella) have gone to Fairbanks to check out the University of Alaska."