Response from Julian:
Mario, we both know I didn't break flat rules, that I was respectful and that I left your property clean and tidy. You still don't get that it's not acceptable to ask people to spend 40 euros on a taxi chasing round Berlin to pick up a set of keys (and incidentally, it was exactly 40 euros, I have the receipt). This isn't me being arrogant - it's a problem with your access arrangements - you need to sort them out! If you can't see that, you will only have more disgruntled guests, which is a shame, because the flat is brilliant.