We have online booked an airport transfer from Berlin Tegel to Potsdam. We paid online before transfer. There driver didn't show up and after calling the company they didn't knew about booking. This happen to us with family of 5 with 3 kids. I will not recommend specially with kids. It look like they have some rendom people with cars to whome they call for giving service. Very unprofessional, non trust worthy and poor.