Any recommendations for Berlin hostels or ones to avoid?
I recently stayed for five nights at the Meininger at the Berlin HBF. I have stayed in a number of hostels and this one was average. So, nothing special and no issues. Common area was busy, room was quiet. Had a 4-bed mixed dorm. All males (me too) while there, no issues with roommates.
Location is excellent. Just outside the HBF, so lots of access to transport and food.
Not sure if your trip has already happened, but I really like East Seven Hostel. Heart of Gold Hostel and Circus Hostel are also fine, but a little 'young' for me these days, late 30s.