It was a perfect day with Elmer. He is a Dutch guide. We had a lovely day with enthousiasm! We saw a lot and he took us to places we did not visit before. It was a great experience. We were a little afraid of biking on the 'wrong' side of the road, but it was not dangerous. Elmer gave my daughter of 14y and myself a very safe feeling. He is very helpfull and he knows a lot about London.