The bunkhouse is a very central spot to start from. You can easily get from here to every part of the city for you're daily trips. It is very central.
China town it is just up the hill. Market street down the road. As well at night time it was ok walking here.
The room was clean and looked as described on the images. The bed was very comfortable. Bathroom was big enough and had a bath tube.
The room outlook was to the backside of the building which was ok, but not very great.
We stayed 6 nights, and had one day no wifi, but that was due to some technical issues. As well the elevator was not working 1,5 days, so climbing up to the 7th floor where the room was - after our day trip for example - was a bit "challenging".
The service personal at the desk was very helpful and friendly.
I would book here and recommend if you like to stay very central and to have a good spot to start right away from.
I would as well suggest bringing in some ear plugs for the night, as the outside air condition on top of the building or from the side building was really loud. For my girlfriend this was ok, for me it was a bit to much noise.
San Francisco was great, an we had a great time here too!