I've now booked up. Flying from Newcastle on the Friday, connection in Dusseldorf, returning Monday. Staying at the Hotel Astoria on Kurfürstendamm. Located near to the transport hub in central Berlin called Zoo. (If my trip adviser research is up to scratch) All in for about £450. Seems reasonable to me. There on my own so if anyone wants to meet for a beer/sports drink/coffee just shout up.