9flats.com ( http://9flats.com ) currently offers more than 100,000 apartments for overnight stays worldwide. The company is always on by innovations from competition . So 9flats.com was from the start the first provider that specifies only inclusive with no hidden fees . 9flats.com was the first for all travelers lump sum to an insurance at no extra charge . And 9flats.com is the only supplier for overnight stays , which allows the payment by Bitcoin . Investors 9flats.com besides the Upspring Holding the venture capital company eVentures , T - Venture and Redpoint .