Do I get a confirmation of residence (Wohnungsgeberbestätigung) or any other documents for my Wunderflat?

Yes, your landlord is usually obliged to issue you a confirmation of residence (Wohnungsgeberbestätigung) for the registration (Anmeldung) with the authorities. If you need any additional documents, please contact your landlord directly. 

You can find further information here: Can I register in the apartment I book on Wunderflats (Anmeldung)?

For our complete guide on registering your address with the authorities in Germany, visit the Wunderflats Hub.