Kafka liked the ladies and he had many relationships. While in the first year of his 'love-of-a-lifetime' affair with Felice Bauer (they were engaged twice but - indeed - never married) he met "The Swiss Girl". In his diaries she was only referred to as W. or G. W. They were together for ten days in a spa on Lake Garda. She was a Christian. He was thirty and she was eighteen. However the relationship (apparently sexually consummated) made a great impression on him for the rest of his life.
Research over the years has finally revealed who she is, and Google search even provides photos. However, very little else (as far as I can find) is known about her. Where did her life lead after an encounter with Kafka? Tsk tsk - I am tempted to speculate.
Here is her image and name. Also some of Kafka's actual diary entries about the incident.
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15 October 1913. Perhaps I have caught hold of myself again, perhaps I secretly took the shorter way again, and now I, who already despair in loneliness, have pulled myself up again. But the headaches, the sleeplessness! Well, it is worth the struggle, or rather, I have no choice. The stay in Riva was very important to me. For the first time I understood a Christian girl and lived almost entirely within the sphere of her influence. I am incapable of writing down the important things that I need to remember. This weakness of mine makes my dull head clear and empty only in order to preserve itself, but only insofar as the confusion lets itself be crowded off to the periphery. But I almost prefer this condition to the merely dull and indefinite pressure the uncertain release from which first would require a hammer to crush me.
20 October 1913 I would gladly write fairy tales (why do I hate the word so?) that could please W. and that she might sometimes keep under the table at meals, read between courses, and blush fearfully when she noticed that the sanatorium doctor has been standing behind her for a little while now and watching her. Her excitement sometimes—or really all of the time—when she hears stories. I notice that I am afraid of the almost physical strain of the effort to remember, afraid of the pain beneath which the floor of the thoughtless vacuum of the mind slowly opens up, or even merely heaves up a little in preparation. All things resist being written down. If I knew that her commandment not to mention her were at work here (I have kept it faithfully, almost without effort), then I should be satisfied, but it is nothing but inability. Besides, what am I to think of the fact that this evening, for a long while, I was pondering what the acquaintance with W. had cost me in pleasures with the Russian woman, who at night perhaps (this is by no means impossible) might have let me into her room, which was diagonally across from mine. While my evening's intercourse with W. was carried on in a language of knocks whose meaning we never definitely agreed upon. I knocked on the ceiling of my room below hers, received her answer, leaned out of the window, greeted her, once let myself be blessed by her, once snatched at a ribbon she let down, sat on the window sill for hours, heard every one of her steps above, mistakenly regarded every chance knock to be the sign of an understanding, heard her coughing, her singing before she fell asleep.
22 October 1913. Too late. The sweetness of sorrow and of love. To be smiled at by her in the boat. That was most beautiful of all. Always only the desire to die and the not-yet-yielding; this alone is love.
Translated by Joseph Kresh