room together
To share a bedroom in a house, hotel, dormitory, etc. I thought my best friend and I would room together when we started college, but then I found out that he had rented a studio apartment for himself. Why don't we room together when we travel to Las Vegas to keep our costs down a little?
room together
[for two or more people] to share a room, as in a college dormitory. Sarah and I roomed together in college. We don't want to room together anymore.