Easily one of the most claustrophobic AND agoraphobic films I've ever seen, in that it made both the outside world, full of dangerous people, and the main character's own home appear nightmarish. Its pacing is snail-speed, but this allows the atmosphere, dread, anxiety and confusion to build effectively, resulting in a chaotic climax. A very human horror film, the entire thing represents the irrational fear of other human beings. This takes many different forms throughout the film, from Catherine Deneuve simply portraying a shy beautician, to the sexually-violent male characters who turn up throughout the story to terrorise poor Carole.
The horror effects are great, the corridor of hands was the most physical representation of Carole's entrapment within her apartment, and there were some truly disturbing scenes involving flashbacks to her brutal childhood. Repulsion is indeed a slow-burner, but is perhaps my favourite of the Apartment Trilogy, as it truly did scare me at points.