Ok, my comments on the rhine-area seemed to annoy you, i think that's the reason for your answer to my post. Sorry for that and for being too direct with my opinion, but: There's no need to compare my suggestions with the red light and drug trafficking district of FRA...
On the other hand there are some very nice places to visit on Kaiserstraße: The English Speaking Theatre, some authentic asian restaurants, the street market, the St. Tropez Bar (Football Supporters Bar of SGE)
