A licence or room-only agreement
Dates and notice
Usually the most flexible and the least protected. The notice your agreement specifies is often short, and a date can move with very little warning.
Condition
Your room, and the shared parts you are expected to leave as you found them. There may be no formal inventory at all, which cuts both ways.
Who to ask
Whoever you signed with — frequently a live-in landlord or a letting agent managing a house in multiple occupation. Ask about the hallway as well as the room.