Looking for feedback pls! I am thinking of getting an Ikea Children Bed with guardrail for my son (We co-sleep currently) due to space constraints. Are there any concerns?

If not Ikea, which will you recommend and where can I get it? I do not want a Double Decker cos my 2 monkeys will surely fall down one of these days. Similarly, those car beds are out due to space constraints.

I am also considering changing to a pull out bed for both of them but my gal has a perfectly good bed which is relatively new.