Location is great, we walked down to the Brandenburg Gate area in about 40 minutes. It's close to a U-Bahn station as well if you aren't in a walking mood.
The staff are friendly and helpful, though we didn't spend too much time at the actual hostel except to sleep. Our room was clean, however the air circulation was poor and it can get stuffy if you forget to crack open the window when you're in the room.
The bathroom on our floor and close to our room was smallish but it was rarely occupied, so not an issue.
The hostel has a few security measures in place so it doesn't feel like there are random people coming in and out.
Definitely recommend staying here if you're looking for a clean, safe space to stay.