This was just the most fantastic walking tour. Martina is a natural historian and a brilliant tour guide—it was a really small group and this felt like having a personalised tour with the most astoundingly knowledgeable and enthusiastic guide. It was so refreshing to get a history of Berlin which went beyond the twentieth-century, and I found the use of the Alexanderplatz area really inventive, too—I usually hear it dismissed but there is so much to see if you know where to look.