I want to get a studio flat somewhere this year (rent obviously), south london makes sense as its closer to home/work.

South london is a bit of a mystery to me, what are the options and anywhere to avoid?
What exactly is so bad about clapham junction?

Balham looks convenient as it has the northern line for gigs and trains to where I work, all I know about on it is based on a 20 year old fist of fun sketch.

Wimbledon seems surprisingly affordable, is there a catch? Is putney as boring as I think it is? Are there any other places to consider. thanks