This was the street where Liesel's foster parents, Hans and Rosa Hubermann lived. It is were Liesel ended up growing up after her mother took her there. Her little brother was supposed to go if he had not died on the train before they got there. At the end of the book, Himmel Street was destroyed by an allied forces bombing run.
The following people that we know were killed during the Himmel Street bombing:
Rudy Steiner and family (except Alexander Steiner)
Hans and Rosa Hubermann