We did the Munich Christmas Market tour and the Nuremburg City Tour with Radius Tours, very happy with the service, reasonably priced and both tours excellent, all the staff were very good, the guides (Sam - Xmas and Jeff/Geoff? - Nuremburg), were both very informative and managed the groups well.
We were initially only booked on the Xmas tour, but enjoyed it so much we booked for Nuremburg as well the day after.
Sam through the busy streets and Markets of Munich and when we travelled by train to Nuremburg, there were a few problems with a new timetable, shortage of trains and wrong type of train, (who would have thought that in Germany) so we had to change at Ingolstadt.
Jeff managed the group very well, gained information from the Train Driver as no one seemed to know where the train was coming in, but he was one step ahead of the crowd and the station staff and got us to the platform and on the train with little fuss.
We will use Radius again when we return to the area, no problems recommending them.