I lived in a rooming house after I graduated from high school. I lived there for three years while I worked at a factory in town and saved enough money to go to college. I did not have a car and my family lived so far out in the country that I had to get a room near the factory. It was a three story place and I lived on the third floor in just a room. Down the hall near the stairs landing was a regular bathroom and just out side the bathroom stood a refrigerator everyone shared. Right there by the bathroom door and the refrigerator were two or three wooden chairs you could sit in to visit. There was no kitchen. I had a little electric hot pot in my room that held a can of Campbell's soup or a can of Chef Boyardee ravioli. The other residents were mainly railroad men as had been the case for decades. The railroad and roundhouse were right behind us. There was also another factory woman and a young man who worked at the county's radio station. Everyone got a long believe it or not. The only drama was every once in a while a rumor would rise up that this certain lady was getting ready to buy it and turn it into a brothel as she had done elsewhere. My mother would declare, "You are moving!". It never happened. But even so I would have fought moving because it was the only place for me.
May already be replied to, but in the Pacific Northwest we call that a studio apartment. Usually the kitchenette is in the same room, and the only separated room (walled off, has a door) is the bathroom.