Just as summarized, pretty much, easy in, easy out.
The bedroom immediately at the top of the stairs had a mattress so uncomfortable I couldn't sleep even though I was exhausted, until around 2AM, I piled 3 duvets on top of each other just to make some kind of cushion feeling. That got me through the next few nights. It's the only mattress I slept on, and my mates didn't complain about theirs, so I assume they'll replace this mattress and all will be well after this.