Hi Nonoka,
It was a bit of both really, the atmosphere and how nice the people were.
I loved the German countryside especially and have even looked into buying a house out there. I was only there over the weekend though, but it was all expenses paid by Audi, which made it even more awesome, love the autobahns and the driving discipline is so much better.
Heathrow is a busy airport but it's not bad at all and quiet efficient, not as efficent as Munich but the Brits could never be as efficient as the Germans!
Are you going to be busting the city? There are some excellent links into central London and I can look into it more for you later. Baggage reclaim was quick and easy to
Amar