www.rightmove.co.uk/properties/154876580#/?channel=RES_BUY
All I can see wrong with it, is that the side-return extension is just a lean-to. And it backs on to a railway line. Also the immediate area St Johns is a bit nowheresland.
But the price seems very fair compared to all the modern leasehold flats nearby going for £550k and with as much as £3600 service charge.
Or for a £450k budget looking for a 1/1.5 bed would you be better off looking somewhere better connected? Tooting also seems in budget for example.