Advice, please read... I am having trouble deciding on a room

So, we are expecting baby number 2 in March and I literally have no idea where I should put her. I have a bassinet ready in my room, which was the same my son used until we transitioned him to his current room. ANYWAYS, we live in a thread bedroom home. Two bedrooms upstairs (our room and my son's room). One bedroom on the main which is currently the guest room. So, do I move our room to the smaller room on the main floor and have the kids upstairs - daughter having our old room? Move son to downstairs room and give daughter his old room? Make now guest room into daughter's room? Idk. My head is spinning. What would you do?