For older travellers one of the most stressful experiences is finding your way from the airport to the hotel.
Option one: Get a taxi directly from the airport to your hotel. It will cost some euros but it's worth it, I assure you.
Option two: Get the shuttle bus to the centre of the city. It will stop outside a McDonald's outlet. You will drag your luggage off and look for a taxi rank. You won't see one - only a lot of whizzing traffic. You will now curse the day you left home - but do not despair! There is a taxi rank but it is on the opposite side of the square from McDonalds. Drag your luggage over there, get a taxi to your hotel and collapse on your bed. Have a nice day!
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From Schoenefeld take the train into the centre or from Tegel take the bus.
It's easy!