I know this thread is old, but me and my hubby bought a house in Graham Road in Mitcham a few months back - we moved out a bit to buy a family home to renovate, we're both 30...and...NORMAL! :)
The neighbours we've found here are absolutely lovely; young families, middle aged couples and people like us. We truly feel like we've made a good choice. We have a huge Edwardian 3 bedroom house for little more than we sold our old 2 bed flat in Denmark Hill, with some green space (Figges marsh) at the end of the road.
I can run to Mitcham Eastfields station in 5 minutes when I'm late (which is often!), we can get to Victoria or London Bridge in just over 20 mins. It's actually quicker to get to work in North West London than where we used to live.
With the wonderful Gorringe Park pub opening its doors on the other side of the marsh (right on the border of Tooting), and Tooting overground ten minutes away having trains into Farringdon, we haven't looked back.
The common is huge and good for kids, the cricket green charming and village-like. Really happy we moved here, and I think for people being priced out of Tooting it's a good choice.
Sure it can be a bit rough around the edges, but we've found it to be so much nicer than what people on forums made it out to be. It's affordable, has its own town centre, and the people we've met so far are genuinely nice people.
There seem to be lots of other people renovating too here, which can only be a good sign :)