So I live a sheltered life, DH and I have never been to London and we have decided we want to go in April half term with our DS. We will be being the train down and it will arrive at London Euston. Thing is, we haven't got a clue Where about to stay that is central to the touristy bits! ( we don't know the area at all or how far away it all is) Just wondering if anyone could offer any travel tips or advice on best area to stay close to everything and also he says that you have To get a Oyster card, is that right?