Does anyone have any experience of this x breed and can anyone give any advice about positive/ negative traits? I am looking at having a rescue dog with this breeding.

Hi
crossbreeds do not have set traits-they can inherit anything from either breed-good or bad.Both breeds have health concerns that good pedigree dog breeders will be doing their best to ensure their stock do not suffer from-you wont be able to get this reassurance with a crossbreed.
Archer

As Archer has said, with a cross breed, what you see is what you get, with no guarantees as to health or temperment. But if you take care with your choice and ask searching questions of the rescue socity, you should be OK. Jackie

Having owned a Boxer, and from what I know about Danes, I suspect you will have a loving, bouncing doofus, on your hands, good luck! LOL