Our 33" 140lb Great Dane girl, Boots, sleeps on the bed (takes up almost a full queen sized stretched out), the couch, the floor or her tempurpedic mattress depending on wherever she wants to be. Sometimes it depends on the time of day. She's never left home alone (can't do that to a velcro breed like a Dane), in fact in the 3 years we've had her, she's never been left alone for longer than an hour at any point. She goes everywhere with us and I wouldn't have it any other way.
We actually had to train her and encourage her to go up onto the couches and other furniture. It took a few months until she was comfortable going up and staying up on her own, and even still, asked permission many times before knowing it was okay. Very smart dog and her temperament is truly one of a kind. So much so that sometimes I forget that she is a dog and not a human due to her wonderful personality.
Never has chewed, never has had to be supervised in the house as a puppy. For such a giant breed of dog that can be prone to separation anxiety (My mothers Dane 30 years ago chewed up all of her shoes and up the side of the wall on her first day home) I am glad that we waited until we had the time in our life to sufficiently incorporate these guys into it fully.
Our other, Kosmo, a 10 month old boy, is still kenneled and likely will be until he's a year old. While he still is a "gentle giant" he is much less of one at this point in his life compared to Boots. He's already 34" and 130lbs... and every ounce of that is like a bull in a china shop sometimes.
No bed for him yet.