I stayed for several days at the Red Victorian. I like it here, reminding me a bit of Berlin’s vibe. You have to share the bathroom with the others, however there are several bathrooms so it is pretty ok. The bed is very comfy. There are a kitchen with many appliances , convenient for cooking own meals and get to know other travelers in the hostel.
Location is good to popular spots in the city. I would recommend this place if you are looking for a hostel in SF