Please can you recommend me some 'safe' areas to live in London.

I will be living alone so my top priority is that it must be in a safe area. My course will be in Stratford, but I could commute if the place meets my criteria. I'm looking to get a small studio/one bedroom apartment with kitchen, preferably at 250-300 pw. I'm aware rents are getting more expensive so one of my options might be to live right outside London and commute, but I'm not familiar with any of the places, so please recommend me if you know any.

('safe' as in low crimes rate, fairly well lit streets at night, not too dangerous to walk alond outside at like 7-8 pm)