A room that forms a perfect square will always be a problem. First solution, move. If you can't do that then you will have to compromse some (we all do). See if you can distort the room boundaries some by placing speakers along one of the angles the square makes. The desk must move to one of the side walls as far away from the speakers as possible. That goes for your assumed sofa bed and any other large obstical. This may seem a bit too impractial, so set the speakers along the S wall maning sure they are equi-distant from the wall boundaries. Toe them in and your listening position should form an isasolies (spelling) triangle with your two speakers. A Eco
busters room tune package should also help.
busters room tune package should also help.