zentern internships

im looking at doing a summer program with zentern internship language practice only does anyone have any idea or experience with the company like if its actually good for learning language and what the accommodation is like as im really looking for a 4 week intensive language course in japan to help me understand what i learned in the first year course and so im prepared in i have to resit which looks likely in august
if anyone has any other language school suggestions please let me know