Who lives in the houseboat immediately opposite the building where anne is living?

In the context of Anne Frank's story, the houseboat immediately opposite the building where she lived was occupied by a man named Mr. Dussel, who later becomes a significant character in her life as he joins the Frank family in hiding. However, there is also mention of other neighbors and individuals in the surrounding area, but Mr. Dussel is the most notable figure connected to the houseboat in Anne's narrative.