TeeCee - I'll describe the very best nursery I saw.
A converted shop, the only windows being onto the street in the "reception area" where the coats were hung.
A middle room, about 12 square metres, for reading stories.
A back room, about 30 square metres, with computers, a slide and room for one table for painting.
A room beyond, no light still, with a row of tiny loos, a changing table and a paddling pool.
Another room beyond with mattresses on the floor for siestas.
SO: NO natural light, no outside space, no possibility of taking the children outdoors ever. Total probably 70-80 square metres for 25 children.
10 euros an hour.