There’s nothing particularly wrong about it, just things you’ll have to live with which are pretty obvious. My main concern would be noise, from the trains (that’s a busy line, not sure if trains run all night but they’ll definitely start early) but also from neighbours and surrounding roads. Because you’re on the ground floor you have neighbours upstairs who you will definitely hear, but also at least 2 sets of people to the side who you will also hear. It only takes one set of those people to behave like ducks (noise at night, rows etc) for your life to be made miserable. Some might also have kids who will, quite rightly, play in their homes. So if noise is in any way an issue for you, don’t buy it.
Other than that I think the flat looks nice, good garden and super convenient as well as close to green space. I don’t think the area is particularly unsafe, not really any worse than most of that part of London and at least you’re close to the station and can walk on main roads.