I joined the tour on Thursday 11th April. Mark, the guide, did a great job escorting us round the city. His talk was really interesting; a wonderful and eclectic mix of information about the city and its history, the places we visited and incidents that have taken place there, and about famous and infamous people who have been to Stockholm. The city really came to life due to Mark's enthusiastic and knowledgeable tour and, unlike on other walking tours I've done, I could alway hear what he was saying. The trip lasted two hours and his stories were all about the right length. A good way to meet other travellers. Highly recommended.