I suppose that in the ideal biggest bed size of anyone, there is a big bed, of 1.50 cm minimum (well, of 1.35 cm is also valid), but until that moment arrives, and you have to live in your house. Parents in your small room, or perhaps in a shared apartment, there is no reason not to take care of the style of that space in which you live, and adapt it to your adult age.
In the line of simplicity, the winner is this other bedroom with a single bed, where nothing more than a modern and elegant bedside lamp and a couple of decorative sheets has been needed to achieve a stylish biggest bed size. Betting on minimalism is another alternative when it comes to small spaces that you want to give seriousness and sophistication, as in the Scandinavian bedroom, which overflows class in every inch of the scene.
If you prefer something more casual, this other single bedroom is a great source of inspiration. All in white, without headboard to gain lightness; a bedside table that serves as a shelf and DIY elements decorating and completing the biggest bed size, as the original bedside lamp made with a tree branch, and accents of color on the cushions and carpet.