Hi Sri,
I know nothing about East Ham - sorry.
If you check websites such as
Find properties to buy, homes to rent, overseas houses and new homes on rightmove.co.uk and
Vebra.com plc - Search for estate agents, homes, houses and property for sale and to let they have information about renting property and that will give you some idea of the costs of renting.
It's also worth checking the fares on
National Rail Enquiries - Official source for rail information, UK train times and timetables since fares usually go up in the UK every January. I agree it's probably not worth driving into London and parking costs a fortune as well as having to pay for the congestion charge.
Regards,
Karen