There is a Church mission on the West side of the main train station, mainly for homeless people and people with problems. But it's very clean, people are friendly, and if one is humble and polite, there is a good chance you can enter to chat (even in English) and sleep there on the floor in your sleeping bag. The night shift opens the place at midnight and everyone has to leave before seven in the morning.
Nevertheless, as a traveller, you should contribute some money to run the volunteer's service or at the very least offer some help. Remember: This is not a place for the unprepared traveller and definitely not a hotel!
The Most Frequently Asked Travel Questions about Hamburg
Where To Stay & Best Hotels in Hamburg - updated Mar 2024
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Hamburg Travel Guide from Wikitravel. Many thanks to all Wikitravel contributors. Text is available under Creative Commons Attribution-ShareAlike 3.0, images are available under various licenses, see each image for details.