Nice video--I just got back from UK on one of these a340s--Overall the plane was nice and new, but having the toilets downstairs didn't work out well. It\s a big plane and lots of people lined up the stairs and into the space above and waited..... Also one toilet closed. I asked the crew about what they t hought. THey didn't like it. Thinking--it seems someone decided that there was more money to be made with a few extra rows of seats than with a little more cargo. The cargo lost.
That's true - concentrating all the toilets in the middle of the cabin instead of having them in different locations also creates traffic jams especially after meals...