What kind of location in Austin reported the most number of crimes?
"Austin" is the district_name; the most number of crime refers to Max(Count(case_number)); kind of location refers to location_description
SELECT T2.location_description FROM District AS T1 INNER JOIN Crime AS T2 ON T2.district_no = T1.district_no WHERE T1.district_name = 'Austin' GROUP BY T2.location_description ORDER BY COUNT(T2.case_number) DESC LIMIT 1