Hi there. I'm selling my son's toddler bed. He only used it for about 8 months. The ikea frame is adjustable for a 3/4 size mattress - which is a potty-training mattress (plastic outside) - or a single mattress, which is a normal one.
It's easy to assemble and adjust and in good condition. I have a single mattress that is in pretty good shape, just a few marks on it.