Car services are rare, expensive, and unnecessary. This forum is awash with people feeling ripped off by them. A taxi from TXL to central Berlin will be in the range of €25. If you persist in booking a car service, Blacklane and MyDriver seem to be reliable and will certainly charge you more.
Bus or bus to UBahn is so easy and inexpensive. I'm a 70 year old business traveler in Berlin every year. I take the bus.
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