DESY is operating a guesthouse which in principle can offer space. At present the rooms are essentially fully booked. The total number is still reduced due to DESY's support for Ukrainian families. Nevertheless, you can try via this link.
We are also happy to provide a hotel list which you can use. In some cases reduced rates are available (see info on the list).
By presenting the employer's certificate at the hotel, the bed tax in Hamburg is avoided.