There aren't as many hotels in Paris that can sleep three as there are in the U.S, so I agree that the Citadines properties are a decent bet. On our last trip, we stayed at the Hotel Paris Indigo, and enjoyed it a lot. It had a funky decor, very nice staff, and a refrigerator for guests' use stocked daily with a few soft drinks/juices. We had one of their suites, and it was on two levels and had an extra half bath. I can't remember if the sofa opened into a bed, but it might be worth checking into because it would offer plenty of privacy for three people. Location was very good for sightseeing.