When I arrived around 5 PM on Saturday, many of the bunks in my 12-person room were occupied with sleeping people, which seemed really weird for that time of day. These people were not there when I returned in the evening, and I don't think they were the same people I saw in the room later. This made me feel uncomfortable.
My room did not have a door lock, only the front door stood between strangers on the street and my luggage. Even with the windows closed, there was a fair amount of street noise that leaked around them. The bunk curtains were flimsy and somewhat see-through. I was in an upper bunk and the curtain was held up by a very flimsy rod barely attached to the ceiling; it wobbled a lot when I touched it. There was no shelf in the bunk, though there was an outlet and light. There was no in-room locker, but the one right outside my room was big enough for my backpack.
Fuqi is a converted house and it shows. Weird layout, laundry on a dimly lit enclosed roof with hanging laundry, single occupancy toilet on the second and third floors, narrow staircase to get from the street to the front desk.
Most of my fellow hostelers seemed to be Chinese speakers (not sure if Taiwanese or Chinese). Most of them were gone on Sunday night.
I'm not sure if Tainan in general doesn't have good transportation or Fuqi isn't in a good area, but I found it hard to get around; I did a lot of walking.
If I returned to Tainan, I would want to try a different hostel.