We travelled to Munich for my brother's stag do. It was a group of 13 so difficult to find a place that could accommodate us all. Casa Barvaria was the ideal place as there are plenty of beds/bathrooms and we could all sit around in the large bar area drinking/chatting.
It is a bit away from the city centre, but there is a tram outside which can be used to get to Altstadt fairly easily.
Thomas was a great help providing lots of advice and recommendations before the trip. Would definitely recommend Casa Barvaria.