What are the arrival / departure times?

You will find the arrival/departure times in the advertisement for a nature house. You can find them under 'Good to know'. See as an example:

After a host approves your booking, he will reach out to you. In this contact the landlord will explain, among other things, how the arrival and departure are arranged. In some cases, the landlord himself will be present at the nature house to hand over the key.