The good: Safe location, very close to popular destinations like Chinatown and only a short walk from the Moscone Center. The rooms are cute and overall it was pretty affordable.
The bad: Their key app for opening the room door didn't work, meaning that the four of us had to share one physical key, which was pretty inconvenient. No air conditioning, which would be fine for some times of year but for us it was a bit uncomfortably warm at night, not to mention loud since we had to keep the window open. Also found a few small roaches in our room if we had any food in our trashcan. The rooms are small, and 4 people felt pretty cramped.
Also, the only ways upstairs are a very narrow and steep staircase or a small old fashioned elevator that is difficult to get into. This created no problems for us, being young and healthy, but if you have mobility issues this is not the hotel for you.
Overall, not great but not miserable. Decent for a budget hotel, but not what I would recommend for comfort.