u/Nervous-Quarter9780

I have a 325 sq ft bedroom with east-facing windows and 8ft ceiling. I'm planning to install a Mitsubishi 9k BTU mini-split, but I'm wondering if a 12k BTU unit would be too large for the room.

Also, based on the attached layout, which installation location (Position 1 or Position 2) would provide the best airflow and overall air circulation? The bed is slightly offset to position 2 as the left side is next to the bathroom.

Edit: Location: Bay area, California. The back wall is an exterior wall. Left wall is the bathroom wall. Right is the window.