Looking for family hotel near London to sleep 4 preferably north. We want to get into central londo but happy to use the tube/trains - last time we stayed in Elstree and used theamslink. We would like two single beds or bunk beds, or even interconnecting rooms as two teen dd's We have done premier inns but we are staying three nights and need a little more space. Would need parking bonus if its free. Any suggestions? Budget of approx £500 as we can rent a small apartment for similar.