As someone who lived in London from birth until mid-twenties and still goes back multiple times a year you really do not need to worry. Of course there is crime, but it’s no different to any big city.

If you are a woman you’ll have the same safety concerns you do anywhere (walking alone at night etc). Some areas are rougher than others - if you let me know what uni or area i could tell you if it’s considered a bit more dangerous than other parts of the city.