You don't even need a lock - he's only a year old:>) Shove everything behind the closed door.
Spend your time now, planning for the visit and gathering toys and games to play with him. You'll be well rested, you'll enjoy his stay and you'll be better prepared to tackle the fabric after he's gone.
As you're sorting fabric, you can chuckle about the good times you had and the time will fly by -
From: Mother of 4 sons,
Grandmother of 6 and
Greatgrandmother of 2.
Trust me, nothing is more important than visiting babies, they grow up waaaaay to fast.
Enjoy