What Is In Your Opinion The Best Restaurant in Frankfurt?

I will be staying in Frankfurt for two weeks next month, my dull job sure takes the best of me. Even though I will be there for almost 15 days I just know that I wont be able to see anything interesting. Or boss wants one month job to be done I half the time, so you might imagine how thrilled I am of going there. Anyway, I guess I will have evenings free at least. What is in your opinion the best restaurant in Frankfurt?

Unfortunately I have spent only three days in Frankfurt, in a visit to my sister. Therefore, I was not able to see much of the town. Still, she took me to her favorite restaurant and said that it is one of the best in town. The place is called Ernos Bistro and it offers an exceptional experience. Food was really excellent and I really enjoyed a wine (they said that they have more than 400 different wines). We even took waiters advice and enjoyed the meal. I dont know about the other, but I am sure this is one of the top five restaurants in Frankfurt.