I loved staying at Bunkhouse. The location couldn't be better if you're looking for Union Square and being central in SF. It is not a full service hotel... Much more like an Airbnb. The rooms do not have blow dryers so bring your own. There is not daily room cleaning and no phones in the room to call down to a desk. But the rooms are clean and very functional with great, simple style. They also have a safe in the room which I appreciate.
The coffee shop and affiliated restaurant next door are great!