Another place from which I like to order burgers from is Burger Dream, in P-Berg. I pass by the restaurant sometimes with the tram and they do have some space to eat on the spot.
You can build your own burger, ingredients are tasty, the meat is good, the delivery time usually good and friendly delivery people. Fries arrive still hot and crispy, something not all delivery services are able to do. A nice option when I’m craving a burger but don’t wanna moove my butt outside. :-p