An extraordinary combination of beauty and subtle, paranoid horror - "growing inured to disappointment". Who else can make snow sinister (scary perhaps, but surely not sinister)? It ends in the middle of a sentence, more tantalisingly still, it ends with a mysterious old woman just about to say something... Very apt for a tale of layers of secrecy and never-ending frustration.
It can be interpreted as an allegory for Jewish alienation and/or as a semi-autobiographical rendition of his relationship with Milena and hers with her husband (portrayed as the mysterious Klamm). Or you can read your own meaning into it.
See my Kafka-related bookshelf for other works by and about Kafka (http://www.goodreads.com/review/list/1199525-cecily?format=html&order=a&shelf=kafka).