We decided to stay at the Adina Berlin having spent New Year 2011 at the Adina Copenhagen which we found to be really good.
We were not at all disappointed.The Adina Hauptbahnhof is in a very convenient location and its facilities are quite excellent.The staff are really friendly and most helpful.
The apartments are equipped with everything one might need.
The only negative is that wifi is chargeable and that we had problems maintaining a connection for longer than 5 minutes (this really needs sorting out, as it is apparently a consistent problem,especially with tablets and phones)
Overall a great hotel with great staff in a really good location.We would definitely go back