My premed advisor has suggestions for what should be mentioned or addressed in a applicant when writing a LOR. Here are just a few of them:
1) General intellectual qualities such as curiousity, honesty, ability to reason critically, to solve problems and communicate
2) Personal qualities such as committment, compassion, empathy, and leadership
3) Did you enjoy teaching or working with the applicant?
4) Background, including steps the student has taken to test his/her goals; ability to make adjustments to demands of family, school, and society;
5) His/her choice of leisure activities
6) It would also be helpful if you would indicate whether or not you would go to this person for his/her professional services once his/her training is completed
Hope this was what you were looking for! Good luck!