I´m currently in my second semester of studies at Leuphana, studying International Business Administration & Entrepreneurship as a major and Business Psychology as a minor.
The Leuphana has a slightly different system than other German universities. Every student (apart from teaching students) choose a major and a minor as well as courses in the area of complementary studies. Most majors are studied for 6 semesters, whilst minors normally only last for 4 semesters. The complementary studies can be compared to general studies at other universities, which means that in each semester, you can choose one module that has nothing or little to do with your major or minor subjects. Furthermore, the first semester is the so-called Leuphana semester, where each student has to take part in 2 major-specific as well as in 3 interdisciplinary modules (normally including a sustainability seminar, a methods seminar and an academic writing course). The Leuphana semester is discussed quite a controversy amongst students as on the one hand it gives you the opportunity to slowly get used to the way of studying at uni but on the other hand, it takes away more or less one semester of major-specific studies.
The general flair on campus is very nice! There are about 9000 students studying at Leuphana which makes it feel a little less anonymous than at other unis. The campus offers several cafés, a cafeteria, lots of green spaces, a gym (including a sauna), a beach-volleyball court and much more.
Course sizes depend on the study program, however, most seminars will not exceed 25 people. Like at any uni, the teaching quality of the professors varies widely but all in all, at least in my study program, the exams are manageable and often only account for a certain percentage of the grade with the rest being accounted for by presentations or written assignments.
Before applying at Leuphana, I´d suggest getting familiar with the special major-minor-complementary studies system. People who don´t like interdisciplinarity might not enjoy studying here! I definitely enjoy it and would recommend it at any time.