I really recommend sleeping on the floor. Big soft beds are just a health hazard tbh, they inevitably become massive bacterial colonies and get noticeably heavier from bed mites. It's also terrible for your back, the lack of stress on your spine weakening it.
Sleeping on the floor using blankets or a thin one-or-so-inch mattresses is far superior. Their really conformable (you might wake up sore at first if you're a pussy). They can be put away - giving you extra space. Their far healthier, and can actually be cleaned and aired out.
Chicks might give you a look when they see, but it hasn't been a problem so far.
I'm currently sleeping on a old cot mattress I found in my family storage but it's pretty good. I've heard good things about nip shikibuton but I haven't tried it.
Remember to sleep straight on your back with your hands straight down by your sides (hands above sheets!), a pillow and something to keep your knees up, and always breath with you nose.