I will be travelling via train from Neuss (near Düsseldorf) to Hamburg around noon on Sunday Aug 31st. I've been checking out the possible itineraries on the Deutsche Bahn website, but not sure if it's best to purchase & reserve now or if I can wait until I get there. They have a Dauer-Spezial for 49 euros posted as available now.
Also, does anyone have a Rick Steves style single accommodation they recommend in Hamburg - preferably close to the main train station?