This was my first hostel experience ever and I must say it's a WIN. Unfortunately, I got food poisoning before arriving at GT so I was basically dying. I went there with a friend and we stayed at a private 2 bed room on the second floor (#26). The room was VERY clean and smelled good (unscented of course). The bed covers, sheets and pillowcases were so too, and so was the sink in our room (great for washing teeth before bed). Nights out in SF were chilly, but the room had great temperature all the time. We got no sound or noise issues either, even though it was over the weekend. Bathrooms were mostly very clean (although after shower times it was wet and some hairs here and there). Water pressure was good and hot water was nice.
Ok so the people were a huge plus... We had a short stay and was sick the first day, but everyone at the reception were accommodating and helpful (very sweet in general). I totally forgot the name of the girl that helped us out mostly (short dark hair and glasses), but she's definitely the best and recommended great places to eat out. Breakfast was good and healthy and everyone was very polite (although the dish washing system is a little funky).
Overall, it was an awesome experience. I regret not staying more days (and being healthier when I got there - next time I'll fly in instead of doing the roadtrip thing) and getting to experience the great activities they have there. People in SF are very kind and polite and this hostel lives to the standard.