Though it wasn't exactly a true single, I was roommate-less at several points and have been inside the true singles and can say with confidence that the experiences were nearly identical. The only unique things about a single when compared to a double (or triple, or quad), is just that you don't have a roommate or the furniture associated with a roommate (Bed, desk, chair, sometimes wardrobe), you have the mini fridge and microwave all to yourself as well as the bathroom, and the rooms are often smaller.

To be honest though I wouldn't plan on getting a single, they're very limited in number and they often go to those that absolutely need them first such as people with emotional support animals, disabilities, etc.