How practical is it to travel from cambridge to london every day for work?

How are cities like Harlow, Bishop, Stevenage and Letchworth in terms if living there i.e. Cost of living, house rent, social life, transport cost etc? My husband will have to travel to Cambridge and i will have to travel to london.|||It depends upon your budget and work, if your business has demand then you should travel|||The trains are always full, and it's only 20odd minutes.|||You may get some useful info here - http://local.upmystreet.com/