It’s like everything - easy when you know how! Not sure if you’re looking at a new 2025 version where things might have changed, but if it’s the same bed as 2020, you just remove the cushions, pop the table into place and place the mattress on top which is stored in the cupboard opposite the sink. We swap the cushions into that empty cupboard at night so the space remains uncluttered. I’d be surprised if we go over 1 minute to set the bed up now. The bed becomes a small double and we’ve come up with an extra little hack to make it a single size. Either way, it’s super comfortable and worth the setup compromise for a great sleep.
I should add, we were impressed with the very easy RIB (?) bed system in the new Club Joker City but it makes the bed quite high off the floor. Not sure how that would work when the roof is down for the upper bed. Could be a bit claustrophobic maybe.