Here is a recommendation of hotels close by the venue (Max-Planck-Institute for Meteorology, Bundesstr.53, 20146 Hamburg)

HotelAddressest. Price*travel time to MPI-M
Mercure Hotel Hamburg MitteSchroederstiftstr. 3, 20146 Hamburg Germany130€8 min (walking)
Mövenpick HamburgSternschanze 6, 20357 Hamburg120€12 min (walking)
IntercityHotel Hamburg Dammtor-MesseSt. Petersburger Straße 1, 20355 Hamburg150€15 min (walking)

*all indicated prices were looked up on the 13th of February 2025 and may differ from offers found at a later date

Alternatively, you can book hotel rooms on the following websites: