I bought this bed for my son. He is almost 9 years old, and he is TALL! He's already 4 1/2'. I wanted to upgrade him from his plastic race car bed, to open sides. I felt he needed to learn to not fall out of bed now, rather than later. We figured we'd get him something to accommodate his ever-growing height, and hopefully this takes him through his teenage years as well. It fits a TwinXL matress on top & a regular Twin underneath. This daybed is super sturdy & well built! You do need to periodically tighten the screws on it, as stated in the instructions. It doesn't state how often, but I figure about every 6 months I'll check them. We take turns laying in bed with him at night to read and pray, probably for 20-30 minutes. I weight around 195, my husband is about 215, and our son is somewhere around 65-75. It holds us just fine! I bought an 11" memory foam mattress to go ith it, a tall one to cover the back hole that shows the wall, but I do still see about 1/2" of the gap, although it's not bad looking. It fits in the room so much better than a traditional bed, because it can be against the wall without looking ridiculous. I actually got this on Black Friday, and I will be watching for another sale, so I can get another one for my guests to use, down in my basement. I love this bed, and would recommend it to anyone!