We stayed at this hostel for a few nights. The woman who checked us in was extremely nice and helpful. The hostel is very close to a tube station (Stepney Green - turn right out of station entrance and hostel is on left after a five minute walk). There is an Asda directly across the street, which was perfect for picking up breakfast food, etc.
Hair dryers are only available upon request and they only have a couple, which is a bit inconvenient since reception isn't open early to borrow one before leaving in the morning. The woman who checked us in was nice enough to lend us one and just let us leave it at the office in the morning though.
Mattresses could be better quality as the bunk bed springs could be felt through them. Take ear plugs or sleep with the window closed, as the neighborhood is very noisy at night.
Overall, decent accommodations if looking for something cheap while in London.