The best thing about this place is the location and the staff.
Everything was close by, max 30 mins walking and that's very good for London. I barely used public transport.
The South Bank, Westminster Abbey, Parliament, Tower and London Bridge, Buckingham palace, London Tower, Tate modern, The Shard, and so many more attraction in walking distance of 30 mins.
The staff are super friendly and helpful. Always with a smile. Also available 24 hours.
The rooms however, are very dingy! Not properly ventilated so the air is a bit sour (and you cannot open the window in winter with 9 people in the room!). The rooms are very busy (I was in a room with 8 others) everyone coming and going all the time even in the middle of the night and slamming the doors. People had washed their clothes and wanted to sry them off on the radiators but they were dripping all over the place so the floor was wet everyday.
Super dirty toilets but the showers were fine.
Also, I read on the description that hairdryers are available. There was only one hairdryer and that was downstairs at the bar. So anytime you wanted to use it, you had to go to the bar hoping no one else had borrowed it. And there there was nowhere to plug it in in the bathrooms! And you can't use it in your room because the others are asleep.
Overall, this is not a place I would go again unfortunately.
(I have been to other hostels with the same price, this was the worst)