Painting the utility room - Which paint? Latex paint?

Yes, putting up the ceiling first is better. For the color, I would rather recommend STO or Caparol from the specialist trade. But yes, you can also use your schöner Wohnen, I don't know if it's still good though.

If it still works, use the Üolarweiss. Cover first. Remember, modern houses are airtight plastic bags. Drying laundry... we dried it in the attic for the first few weeks. That's what people always did. Then Spak on the garden cushions that are stored there in winter. Sh... I thought, that won't work, too little air exchange. We were already wondering why the drying takes so long. Then buddy Karl, who is an electrician with a store, bring a dryer. He brings one, we use it for drying, then the attic suddenly dry as a bone again.

If it is a small basement window, and without [Kontrollierte-Wohnraumlüftung], then better leave drying open there. Yes, ceiling first, then the walls, from the light to the door. In principle, the utility room is just for practice.

. It was just a basement room with a small basement window where the heater was located.

In other words: continuously ventilated and well heated.

Feel free to take your paint. We’re talking about the utility room here. No one will see your fancy paint anyway.

Demeter Moonlight White is good though, Karsten

The work is done. The bucket said "for 80sqm." Unfortunately, it wasn't enough, but almost. The room is 13sqm. I had hoped for something a bit different, but oh well. It looks quite good though.
Why do you actually always paint the ceiling away from the window? I did it that way, but I think it would look just as good the other way.
And for drying, I might rather start a separate thread. I don't see that as a problem yet, after all, there is even underfloor heating in the utility room.

The work is done. The bucket said "for 80sqm". Unfortunately, it wasn't enough, but almost. The room is 13sqm. I had hoped for something different, but oh well.

80sqm of course refers to the surface area to be painted, not the room size.
You probably painted around 50sqm including the ceiling, maybe even twice?