As a former student of business administration, currently studying sports sciences, I can review my time as a student in Graz from two perspectives: The business faculty is very anonymous and crowded. You are on your own at university, the most helpful tool to get additional scripts and information is actually the facebook community. Even though conditions got better in the last few years, if you consider studying business administration, you should probably go to WU Vienna.
Sports sciences are totally different: Since there are way fewer students (between 40-70 new per semester) and the fact that there is only 1 lecture room, students know each other and the professors know the students, which creates a very friendly environment to study. Since I am in my first semester, I can not judge the level compared to other universities, but all facilities are easy to reach, on a timely standard and due to the good organization you do not have any trouble practicing or missing courses.