I love living in London, but I'm in my 50s and not trying to stretch an average salary to current London housing costs. That makes a huge difference to my quality of life. My children (mid 20s) love living in London but there's no denying it's very expensive.
That house looks about the same size as our first house in London (also SE) which we bought well over 30 years ago for (brace yourselves) £42k. 3 bedrooms (one tiny), extremely small bathroom, one small front reception room, one small back reception opening onto galley kitchen, very small garden at the back, minuscule garden at the front. Zoopla says it's now estimated to be worth nearly £550k. This is madness.