After a long trip, coming to where you're supposed to relax and not being able to because you don't know what a lockbox is and the directions to it are unclear was a stressful and demoralizing situation. Please provide an image of the lockbox for future guests that will come after check-in hours.
First come first serve dorm bunk bed is understandable but unsafe when the possibility of an injury is high. Not being able to have a bottom bunk bed when one is overweight is something that should be communicated appropriately so the guest can make the correct choice for their health.
The bathrooms, especially the shower cabins were extremely uncomfortable, small & improper. It would be a nice addition to have changing rooms/place since you cannot change in front of other strangers in your room (unless you have a private one). On top of the minimal to no space, there isn't any room to unpack your things and only ONE chair in the shared space rooms.
Besides the spatial troubles, it was a nice little hostel in the middle of the Gaslamp Quarter, and yes, it was loud & noisy until 3-4 AM if you are on the wrong side of the building. They do provide earplugs, but good luck.
It was safe as a lone female for the limited time I was traveling there.