My wife (who is German) and I have been eating at the various incarnations of Der Kaffee Kuchen for more than 12 years. We have never had a bad meal, although we still long for the larger menu they had when they were located on Camelback and I-17. All whining aside, we like the quirky atmosphere of their current location. It is kind of like sitting outside at a street side restaurant in Germany... well maybe not quite, but it is fun.
The food is always excellent. My favorites include the Zuericher Geschnetzeltes (veal strips and mushrooms in a cream sauce), the Rinderroulade (beef roll stuffed with bacon and a pickle) and the Schinken plate (ham cold cut plate). My wife's favorite is the Beef Goulash. On holidays they sometimes have a German buffet and these are great opportunities to try lots of different things.
One thing to remember is that everything is prepared fresh, so don't show up planning to eat in 30 minutes so you can catch a movie. Take you time, enjoy a beer, have a great meal and go home feeling relaxed and satisfied.