The Holiday (2006)
Two heartbroken singles (Kate Winslet and Cameron Diaz) swap houses for the Christmas holidays. Amanda (Diaz) tries out the charming English cottage owned by Iris (Winslet), while Iris can't believe her good fortune at getting the run of Amanda's L.A. mansion. Both are way out of their elements, but eventually find love in their new locales.
Moral: Keeping your home comfortable for guests, with things like extra blankets and blackout blinds, guarantees that they will be able to rest easy and enjoy their stay to the fullest.