I don't think you're being unreasonable but I do think you're being naïve. The FASTEST way to lose a friend is to give them or let them borrow money. It almost never works out. One day you'll see her with a new XYZ and it will piss you off. Or she won't come through with cleaning your apartment. Were you going to have a contractual obligation? Even so, you'd have to take her to court and sue if there was a breach of contract! Do you see how this gets complicated fast? I'd stay out of it. Its nice that you want to help your friend, but its best to keep financial matters out of friendships.