My game room is bigger than that. It's on the ground floor, usually the coolest place in the house, well it's always the coolest since my psvr and projector are in there.
I used to live in an apartment about that size, student housing, 12 to a floor, shared kitchen. It was cheap so I stayed there when I started working and filled it up with expensive electronics. Literally one wall was my 'tv' with a second hand CRT projector pointed at a white washed wall. Bed was also the couch, fridge shoved in a corner with a microwave and surround speaker on top, desk under the 'screen' with gaming PC. Center speaker on the desk in front of the keyboard, more speakers all around, the subwoofer was also the 'table' for receiver and laserdisc player.
It was on the 12th floor and got really warm in summer with all the electronics venting their heat. No AC, just a door to a small balcony. Anyway it's not the size that matters, it's what you put in it :) Plus having everything together made it much easier to interconnect everything.







