Looking for accomodation

Dear all, we are a group of 4 people all 4 of us cabin crew and we will be based in DUS airport from 1st of June.
We would like to find a house or apartment with 4 bedrooms in an area with good transport to and from the airport.
Any suggestions about where to look/areas/sites are welcome.

Thanks in advance!

You should check the usual classified ads sites like Quoka and Ebay Kleinanzeigen.
It is very unlikely, however, that you find something on such short notice (1.Jun. is only 3 weeks from now) or without viewing the apartment and introducing yourself personally to the landlord. Therefore, you should arrange temporary accommodation for the first weeks, e.g. a hostel, B&B or serviced apartment.