Book Room - toefl my favorite room

My favorite room is my book room. It is a rectangular one with the dor on the left side of the south wall and a big window on the right side. Below the window is a desk and there is a chair facing the desk. A huge bookshelf is attached to the east wall. There is a round table in te center of the room. This room is very simple and I don't add any decoration to it because the only thing I want to do there is to think and communicate with people I respect, you know , the authors of the books.

Instead of my favourite room is a book room you could put My favourite room is my library.If it is where you study then say My favourite room is a study room.

Thank you for your help. I will take your advice. yes, it is for the toefl test.