It wasn't great. I stayed in the dorm rooms and they offered the bare essentials: a bed, some sheets, lockers, and running water. No soap, hand towels, etc. You have to pay extra to use a pillow cover! Gross! Toilets and showers were pretty gross when I stayed as well.
Had a couple people smoking in the room in the middle of the night, even though there were many signs saying no smoking.
And DO NOT waste your money on the "breakfast". 5€ can get you much more at any boulangerie or cafe than what they give you--half a baguette, a hotdog bun, a little cheese, apricot jelly, butter, orange juice (not bad), and coffee (also not that bad). Go somewhere else for breakfast.
Overall, you get what you pay for. It's a place to stay for a night or two rather cheaply, that's for sure. But it might be worth the money to stay somewhere nicer.