I included a screenshot of how much the bed is going for in a website. The one I’m offering does not have the bookshelf or the desk added, but it is the same brand and model.
A twin mattress fits on the bottom and another twin mattress on top. If you have the room, you may put a low bed on the bottom sticking out from the frame (you can check the link to see what that would look like), but if you don’t have room, you can place a twin mattress on the bottom that is parallel with the top mattress.
You would need to disassemble and take with you. We can help you disassemble, but would rather wait until it is bought because we don’t want to lose any parts.