2 year old room

okay no judging looking for others opinion.... my family is currently living in a two bedroom apartment with 1 roommate. So its my husband, me, our son and our roommate... Our son has always been in his own room until we moved into this apartment. We want him to have his own room again and we were thinking about converting our walk in closet in to a room for our 2 year old. we would obviously leave the door open what do you ladies think?? we dont hang any of our clothes so its just empty space not being used. Please no rude comments.