I was there November 2012 on a weeknight. It wasn't very busy but all in all, I enjoyed it.
I prefer black or arab guys but no luck there but I did have a good time with a really handsome guy (he looked very like Rob James Collier from Downton & Corrie). I would go back again, no problem.
Chariots sauna Waterloo is a gay sauna with sauna cabin, steam room, 35 private rest rooms, internet cafe, and video room