The Fichtekränzi is a typical Frankfurt applewine tavern. You will find some of them in this area (even in the same street) and actually they're all good. The food they offer is traditional and sometimes modern at the same time. You can sit there for hours and drink and drink and drink...
If you want to get a taste ( in the literal sense of the word) of Frankfurt food you should visit one of the Applewine taverns. They also offer some nice beers and traditional pub food like Schnitzel, Handkäs, Green Sauce and others. It's just what the locals do: they go there for a proper meal and have a few beers or applewines and chat for hours