I like the friendly atmosphere, the friendly teachers who actually correct poses (a lot of studios I've been to don't give feedback on your movements!). It would be good if there was more variety in the classes after work (6-7pm)- I really want to try to hot inferno pilates and wheel therapy classes, but there only seems to be hot yoga on when I can go in the evenings.
The range of classes are great and each individual class is consistently proactive and rewarding. The people are great and the vibe is always welcoming. I doted around a lot of different venues before I found Balham hot yoga, it's my fave.