Have posted on this already but still deliberating. Essentially future housemate (who I know and like but have never lived with) has said she would like her dp to stay about 3 nights a week at our place, but not possible for her to stay at his. I don't know whether to just suck this up. Plus side is she seems nice, down side is I didn't sign up to have couple in kitchen and communal spaces... Plus where do you draw the line?