I say Single because a married person's room can be all "hers" with no fuss.
When my Wife left me, it was not really supposed to be forever. Therefore she left most of her clothes behind.
My clothes at that time were safely locked in a closet where no one could see them without a warrant!
Gradually, I started to exchange my wifes clothes for my clothes. Her shoes for my shoes, ect.
When the kids came to visit the first summer my room was exactly like they remembered it. Everything thing there was thier Moms. Of course "His" stuff fit into one big dresser drawer.
As the years went by the kids never noticed anything because they were used to a feminine room. In other words it looked like it had always looked.
When my oldest daughter came to live with me, I found her in my room going through the closet. She said she needed a sweater or sweatshirt and and she knew she and her mom were the same size. She looked at the sizes of all the garments and looked at me, and looked back...and smiled.
She was 16 then and never said a word till that May when she gave me a "Mothers day" card. She also bought me some lipstick and told me mine were not "in style".
But that's another story.
The bottom line is that my bedroom is very much a woman's room. My room is my safe haven, and it reflects ME, not the person everyone wants me to be. Everyone I've dated has commented on how feminine it is. My kids even the ones who don't know about Michelle, just don't give it any thought. When my youngest daughter brought her bf out to meet us, me and her sister, the bf remarked on how feminine it was, even though the room he was in was very much a boys room. My youngest said "Oh, Dad's just sentimental, he's never taken Mom's stuff out".
That was that.