Looking for a room in South / South West London

I'm 32 and currently living in Brixton Hill (which I love!), but sadly need to move out of my current flat as my housemate is moving for a job in North London. I love the area and also grew up in Wimbledon, so I would like to stay either South or South West London (ideally Brixton, Tooting or Clapham).
I'm out and about quite a bit, but really value a cosy home and like to get on and spend some time with people I'm living with rather than just be housemates. I work in an auction house and am in the office minimum 4 times a week. Also a huge dog lover and often help with dog sitting.
I'm looking to move around early July, but can be a little flexible with this. :)