Invited guests can be accommodated at hotels or receive a lump sum which includes accommodation expenses.
Accommodation expenses should be calculated according to the Federal Travel Expense Law or the regulations of the third party funding grant. The regulations usually calculate 60 EUR per night. In Berlin, you should calculate about 80-90 EUR per night.
If you plan a 2-day conference, accommodation for the dates of the conference (1 night) can be granted for invited speakers from Germany and Europe who can easily travel within one day. A second night can be covered if the invited speaker is not able to arrive or return home on the same day. We usually recommend to be able to calculate 2-3 nights for invited speakers from across the oceans.