nice and affordable area in east central london?

I and my friends a looking for accommodation close to City University, that is not expensive like Islington but not too dangerous like Hackney. I have got these areas in mind but I myself have not been to these areas and don't know if the areas are alright.

- Mile End

- Bethnal Green

- Old Street

- Shoreditch

- Kentish Town

- Upper Holloway

- Aldgate

- Whitechapel

If you have lived in any of these areas before, please leave your comment of how that area is like (security wise), are they people there nice? transport (not too important) and if possible, streets to avoid.

Any other suggestions of other nice areas are very welcome, as long as they're not too far from City University Campus (Angel, Old Street, Barbican and Farringdon stations).

Many thanks in advance.