I stayed here for one night in June by myself. I chose it for its location to Victoria Station, as I was getting a train in from Paris to Kings Cross Int'l and it was easy to get from there to Victoria, and then walk to the hostel.
Check in is at the back door. The guy who greeted me was super friendly and got me settled in pretty quickly. I was in a shared room of about 6 people, and it was a little untidy from others staying there, but that didn't bother me.
The rooms had decent sized lockers, so I was able to lock up my valuables while I went out into the city.
I found the bed pretty comfortable, no complaints there. I was lucky to get the bottom bunk, which I wanted as I was going to be leaving early in the morning.
I really appreciated that they had free maps for London!
Overall, a cheap hostel, and I was happy so I'd probably stay again.