I will be travelling to Berlin in April for a week, and I am having difficulty deciding between the Hotel Adlon and the Regent Hotel Berlin. I have stayed before at the Regent when it was a Four Seaosons hotel, and had a great experience. A lot of the reviews on the web describe the Adlon as the best hotel in Berlin, but I have also heard that the service is better at the Regent. Which hotel do you think is the best in Berlin?