Hey Justin -
Sorry that you feel that I tried to cheat you, that was definitely not my intention!
I was in town to speak at a conference and since my company has an EU team, I offered a place for any of them to crash if they wanted to watch my talk. Unfortunately there was no way for me to know how many people would accept until afterward. I did mention that fact when I was dropping off my bag and I updated the reservation and paid the full amount to reflect how many people were there upon leaving, which I felt was only fair to you.
Again, sincerely sorry for the bad experience, I feel that I'm usually a pretty easy going and respectful guest. Also, I'm legitimately sad I won't be able to stay in your apartment again because it was the best I've seen in Paris :(