I'm a long-time lurker but only just able to join the forum. This year has been exceedingly dry for opportunities to meet escorts, but I thought I would share some of the places I frequented when posted in Basel at the start of the year:
Sexhouse Basel (Brantgasse near the congress centre) - this had 4 or 5 floors, each arranged as separate flats with 2-3 ladies there (the website also advertises TS but I never saw any in 4 or 5 visits). Price was CHF100 for 30 minutes, usually including FK (once I had to pay CHF20 extra). Each floor had a "theme" (e.g. thai, chubby, hot - all non-asians were eastern european). Standard varied - some not so great, but I had some extremely good times there
FKK Basel (Ambacherstrasse) - I went to this club a couple of times. They charge to enter (CHF80 I think). First time was a Monday and they were doing a special with a buy-1 get-1-free entry pass, so was able to come back another time. Lots of girls with hardly any punters. Cost was CHF60 for 30 minutes with FK. Entry included 3 drinks plus buffet and there was a jacuzzi (not used any of the times I was there). Nearly all (or all) of the girls were Romanian