Looking for Business Partner - Airbnb collaboration

Living in Berlin and used with the Airbnb concept? Since some time now, I have been thinking about opening an operational start-up that will serve the rental community in the capital of Germany. There are many business ideas in the united states or UK that can be implemented in Berlin as well. For example a drop-off system for keys or cleaning services. Have you lately been thinking about the same wave?

I am open to see more options and what can be explored along this areas within the Hospitality industry.