I just reserved a room in a Motel One for three nights + breakfasts for 351 Euro. That's not exactly cheap, but I don't think it's really that expensive.
Yeah, lots of hotels in the $100-160/night range in Hamburg especially during that time window. The Radisson (attached) is unfortunately pretty expensive, especially for a Radission Blu, but very convenient especially if the weather is inclement, and being able to run back to the room throughout the day (vs a 0.5-1km trip by foot or car or whatever) is really nice. Radisson cancellation policy of one MONTH in advance is pretty annoying, though.
https://techcrunch.com/2023/10/03/motel-one-says-ransomware-...
From another source (non-English) I get the data (5TB) is available on the darknet.