Quality: Voice
The student uses an unusual format here: a diary/personal letter. Therefore, the piece contains abbreviations as if it were written informally (e.g. 'didn't'), but it is still written in excellent, clear, and particularly accessible English. That the student sets out the style immediately really helps the reader.
The student successfully makes this a very personal piece of writing, showing that it is possible to do so and still achieve academic rigour in writing.