This is probably too late, but I have beed to Sudfass Frankfurt twice. It is a lot cheaper than Palace & Oase at 20 euros entry (they may try to get 30 but say that you have visited before).
Walking distance of HBF
Bed in kino that you can draw curtain around
Bit run down
Distance to rooms
Quality of girls/women
Free food is crap, no free drink
I think that local workers use it so that it is quite busy later on and naturally they will ditch you to look after regulars.
I went back because first time I was there a young Asiatic/Chinese girl came in with 2 lads and we had an impromptu bukake - she was excellent much more enthusiastic than the paid help.
Hello you say it is walking distance from HBF how about some help with directions