I just read, I can't tell you why it's great. Probably, it's Hemingway's gift for speaking to people and places that are completely desolate - like his later countryman Hunter S. Thompson, through personal experience he came to relate to those people and places, and can recreate them in his fiction with unsettling realism.
Whatever the reason, I highly recommend this story. I felt some similarities to J.D. Salinger, but where Salinger is more descriptive of context, Hemingway strips back the context, and reduced his story down to the bare dialogue - it is through how they relate to others that we learn who his characters are, and as the story ends, feel we've gotten to know them ourselves.