Mine have vetbeds/cheap fleeces/memory foam mats from Poundstretcher although I am thinking of a big comfy bed for the youngest one, who is a delicate flower

any recommendations welcome.
They can be in living room, hall or kitchen, that's it. Any pestering behaviour and they're out or in crate. One is very happy snuggling on sofa but the other is a fidgety bum who likes standing on my kidneys so he's usually on the floor.
Rabasta, without sounding like Granny Mush, depending on the age of your GSD, just be mindful about the pup slipping/splaying on slippy floors, while it's hard to do damage to genetically good hips and elbows, it's best to avoid that sort of hooning, a lot of my friends put running mats down on wooden floors when their dogs are younger.
Having said that, my now 8yo is HD/ED free despite spending his first 12 months launching himself from great heights, horizontally, getting legs stuck under book cases etc, and is still a bit of a rocket