Great place, centrally located in up and coming Pimlico.
If you don't mind sharing a bathroom with other guests this place does an excellent job. We never experienced waiting in line, dirty bathrooms or otherwise and it worked out well for us despite there being an (almost full house).
We visited first time about three years back and the place could use a touch of paint here and there after some years of wear and tear, but it's significantly better (and cleaner!!) than most hotels / hostels in this price range for sure.
The beds are very narrow for two people (120 cm?) so be prepared to snuggle up with your travel buddy!