Questions & Answers about Pladsen ved vinduet er ledig.
Because pladsen is the definite form of plads, meaning the seat / the place / the spot.
In Danish, the definite article is usually added to the end of the noun:
- en plads = a seat / a place
- pladsen = the seat / the place
So Pladsen ved vinduet er ledig means The seat by the window is available / free.
For the same reason: vinduet is the definite form of vindue, meaning the window.
- et vindue = a window
- vinduet = the window
So ved vinduet means by the window or at the window.