The mattress in my apartment feels like a bowl of jello with springs embedded in it. I would like to find another one - different firmness and also twin instead of queen size. It is a studio apartment, and a twin would give me some living space. I have run into some different ideas about mattresses in Taiwan. I would like to learn enough about mattresses to be able to make a good decision. They are rather expensive, and a mistake would be costly, in terms of $$ but also quality of life.
I’m not sure what you mean by twin, but there are lots of mattresses to choose from at Ikea, with lots of pictures showing the differences between them, and staff that speak English if you need them.