To help with your research on whether the Olympics has been a successful regeneration project for Stratford:
Government Index of Multiple Deprivation map. Search for Stratford (postcode starts with E20) The area in question is around the Queen Elizabeth Olympic park.
Zoopla gives you an idea of house prices. Again, search for Stratford. Remember to compare house prices with other London areas. They may look expensive to you but put the prices into context with the London housing market!