The Bauhaus is a fairly standard hostel. Nice bar downstairs, and the room (I was in a four-bed one) was clean. The staff were all really nice.
The bathrooms were OK - apart from the fact that the showers had one of those 'push' taps that you have to keep pressing in order for the water to flow. When you took your hand off to do anything, the water stopped. Not great, but I guess it stops people from having long showers. I wouldn't have liked to have to contend with it in the winter, though!!
My major gripe was that my room (Number 2) was right above the bar. The bar stayed open till 4am on Friday and Saturday nights (the two nights I was there). I didn't get any sleep. (I heard other rooms farther away were fine in this respect...)
All in all, I'm glad I stayed here - it was very cheap (about 13 euros per night) and I met some really nice people here. Without them, my visit to Bruges would have been much less fun. But, after 2 nights of 2-3 hours of sleep because of the bar noise, I was very happy to get to Brussels and my nice, private, single, hotel room!