There is a friend of mine whom I only meet 3-4 times a year. Every time, we go to a different bar/cafe/restaurant, either in Saska Kępa (closer to her) or Ujazdów (closer to myself). By chance we chose Eden for a May meeting of ours. Eden Bistro is in the locale of a former other restaurant I was not a great fan of, so I am really happy about Eden.
What you can find in Eden’s menu just cannot be beaten. There is for example a salad of asparagus in tempura or laksa with sea buckthorn. Of all the healthy / vegan / vegetarian options in town, theirs is really something to be proud of. The menu can be consulted here.
A cute feature of Eden is their glasshouse in the garden. You don’t have to sit here, there are plenty of tables outside as well, but I can imagine an important party / meeting in a casual atmosphere taking place here.