We really loved our time in this apartment. It's the perfect size for a couple and is located in a beautiful block on a really quiet street, moments away from both the canal and various local bars and restaurants. Access from the airport is easy and, once there, you have a choice of U-bahn stations that can be accessed locally.
Alexander himself was prompt in his communication with us and helpful when showing us the flat.
Overall I'd recommend highly and would happily stay here again.