The shower only worked partially, heating didn’t work at all (we got a small portable heater on the last day) it was not really clean and very dusty, and the bed was really bad for any back. Overall cheap for London of course, so you cannot expect anything amazing but the price doesn’t excuse the state of things overall (still almost 100€ per night!).
Also, luggage storage was in front of the fire exit, which doesn’t seem very safe.
The people at reception were very friendly though and check-in was easy.
Overall really wouldn’t recommend, for just a bit more money you would get something much better and more comfortable, just as central.