As a local I would generally avoid the area around Marienplatz (with a few exceptions), as it is way too touristic and full of bad and overpriced restaurants. However, this well-known place is quite a gem and offers an amazing view over the city center, as well as the New Town Hall (Neues Rathaus in German).
The highlight (as you have probably guessed from the name of the café) is that you can watch the Rathaus-Glockenspiel from a very nice point of view. Also the restaurant is very romantic and has a nice ambiance, so it’s a great place for a date night. My girlfriend and I discovered it exactly this way by chance, by asking our friends for a romantic place in Munich to have dinner.
As the restaurant is open the whole day, you can also visit and have breakfast, brunch, lunch and just coffee and cakes. The menu is changing, but expect an international/European food selection. Keep in mind that the price level has a premium due to location, and always reserve a table in advance.