Stayed two nights here. The location is excellent, right off the Piccadilly Circus tube stop. I booked a large room but got a 4-bed. Apparently they book up sometimes, even in off season. The beds were comfortable enough, room was warm, linens included. The bathrooms weren't ever too crowded, but got pretty disgusting. They cleaned every day, but you still saw some disturbing shit (seriously, somebody actually shit in the showers and bathroom floor!
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"Breakfast" was free, and included a piece of toast and cup of coffee. Overall, for the price (£12) and location, it's a pretty good deal.