Clean and affordable!
Some pros are the friendly staff, numerous private bathrooms with showers on each floor, the ease of entry and check-in, a nice kitchen and communal dining area. It seemed that each bunk had a lamp, fan, and curtains, making it a comfortable and private sleeping space. The hostel's location is practically on top of Pike Place Market, which is a good tourist attraction and has numerous interesting food options. I rated the location 4/5 stars only because there is a significant homeless population, and the area can feel a bit sketchy at night.
There aren't many cons - some rooms are above an adjacent alley and on one of my 4 nights there a garbage truck made quite a bit of noise beneath my window for quite a while.
Altogether I'd recommend it, and would likely stay again on a return trip to Seattle!