We will have a 10 hour layover this Sunday at the Berlin airport and I want to ask followup question. We may practically only have 5 hours to spend in the City (9-2) and depending on the weather we thought we might just take a Taxi to a Christmas Market, then take a taxi back to the airport giving us plenty of time for check-in. Which Market would be best to be able to Taxi back and forth to Airport, while providing a little walk around sight seeing. It seems Spandau and Charlottenburg Palace are on the walking tour (if we had enough time to take the afternoon tour). Thanks in advance.