Ella is now an established spot in the central part of Munich, not far away from the Technical University (great after-party spot if you visited the Cafe Vorholzer Terasse).
I found it absolutely by chance one warm Wednesday evening. It was around 20:00, the sun was slowly disappearing and my girlfriend and I just had finished a huge dinner nearby, but we were not yet feeling like going home. Walking around the area around Königsplatz, we suddenly heard live music and we saw some very well dressed people having cocktails in front of the Lenbachhaus. Initially, we thought that it was a private party, as it did not really look like a restaurant, so we decided to try and crash it. Turns out, it was available to every one, so hurry up and plan a visit.
The restaurant has a magnificent view of Königsplatz and it is generally a very peaceful, yet very central area. You can also have only drinks outside. Cards are accepted. Sitting inside during winter is also very nice.