A Piece of Note open to the first guy

Hi to whoever discovers this note. I am somewhere, waiting for you. If you can solve the riddle, come and find me.

This is a place I used to study,
It's not always quiet, but it's clean and tidy.
It's big and when it's sunny,
sunshine comes through the windows and makes me happy.
If you can solve it, come and find me.
I'll be waiting for you before the next class of Astronomy!
--message: if you can solve it, write the answer down below and give it to me