So I definitely think 2.52 is sufficient. Currently, in the apartment, we have everything between 50cm and at the top 3.5m. I hate it. You can't reach anything and to me, it feels like a hall. My wife thinks it's great. We once measured 2.47m and think it's OK. So I find it cozy. And when I read about the staircase, we'd rather leave it as is :0