The Twin-XL bed at school is uninviting because it is designed to prevent bed bug infestations. Your bed should be a very inviting place: you will sleep on it and people will sit on it. We are going to make your bed. Let’s start with the foundation.
The foundation of your mattress is going to be a shelf-liner and a memory foam mattress topper. The memory foam topper will soften your hard mattress. The main drawback of a mattress topper can be that it shifts on your mattress. To prevent shifting you will first place the shelf-liner (increases friction) on the mattress. Then, you will place the mattress topper on this.
This next step might be too much if you don’t suffer from allergies. Because I have allergies and because the memory foam topper makes a great dust magnet, I zip up my mattress using a mattress bag. It will prevent dust from settling/escaping and moisture from compromising the foam.
After the mattress bag, I use a cotton mattress pad to make my bed fluffy. Now your mattress is inviting. You just have to choose your bedsheets.
You will need at least four bedsheets and a dozen pillowcases. I get plain gray bedsheets and pillowcases because they minimize staining/visibility of stains. If you plan to have lots of guests (you probably will), I would buy more bedding because you should change the bedding between guests. You will need a lot of pillowcases because your pillow collects all oils and flakes from your head. I change my pillowcases every other day. This will help prevent acne!
A great bed accessory is a wedge. I recommend it for watching TV in bed and for when you have guests — it beats having to make a ramp using pillows. I recommend the 12″ because it compresses when someone (or two) are on it. Buy an extra pillowcase or two.