The film is very pure and clear and transparent, like water. In remembering it I am seeing it as pale grey tone, though it's not made in black and white. It's quite restrained and the emotional pace is well controlled, rising like a wave gently through the film.
The acting is very good. In particular Ulrich Mühe as the Stasi agent. The actress girlfriend is played by a very beautiful woman called Martina Gedeck, who to my chagrin I notice is almost exactly my age (about five weeks younger).
happytune's review here.