Yeah, this is the kind of episode i love. Poor George, all alone at home while his mother is gone, only to find out that his grandmother is an old powerful witch who is going to end up devouring him.
I like the parts where George talks to himself and has conversations about what to do next. The house looks also very spooky and that helps to create an ambient for the show to be experienced in.
The ending was kind of expected for I knew this was based on a Stephen King's short story, so it is kind of given that a monster is going to eat someone up.