I can't really imagine it either - looking at it completely neutrally. I'm almost certain that something else will be added. I would lay parquet or Ceralan in the living/dining/office etc. areas. You can do that really well yourself.
Unfortunately, I can't change that. I have the email in front of me. If you don't believe it, ok, that's your right, and I won't try to convince anyone of anything here. But then you should (and this is really! not meant badly) hold back in this thread and make room for a constructive discussion. If there are any additional costs, it won't break my crown to admit it here. A fake / not fake back and forth discussion leads nowhere and only wastes our time.
I would lay parquet or Ceralan in the living/dining/office etc. areas. You can do that really well yourself.
Correction: the office will not be tiled! But the living area will, since the large terrace door is in the living room. I don't feel like worrying every time the kids or I come in from the garden whether a small stone in my shoe will ruin the floor in the living room. Since it will be an open living / dining / kitchen area, having different floor coverings would probably be a bit strange.