"Matěj often sleeps at the office."

Translation: Matěj často spí v kanceláři.

[alback-isback]

"matěj často spí v pracovně" ....přijde mně to také jako korektní odpověď

[Pollyhs]

I know that the article is often not used. But is it a choice or a must? Why is Matej casto spi v tu kancelari incorrect? Why is the the- tu not accepted?

[VladaFu]

feminine locative is v té kanceláři, I'd say it would be stressing it is in that office. His regular office is just "v kanceláři".