Below you will find a model of accommodation certificate. You can copy / paste the text or simply download the sample. Do not forget to complete the document and have it signed by your host.
I, [Name Surname], born on [date of birth] at [place of birth], residing at [your full address] hereby certify on my honor to host at my home, free of charge [Madam, Mr] [First Name Last Name], born on [date of birth] at [place of birth] of nationality [country of birth].
Done at [place of declaration] on [date]