Wow, this is surprising for the IC! I haven't stayed there for about 2 yrs now, but was always happy there.
Obviously you went in through the "wrong door"* - they do have an entrance, which I think you discovered later on. The price you paid seems outrageous - unless there was some major event in town. I used to pay in the 120-150€ range.
No free internet?? I thought all IHG properties come with free internet these days (at least if you are a member of their program)
Still, sad that it didn't work out for you
Who did you end up flying with?
The Skycourt lounge is a contract lounge that also serves *A (SK and LH list it on their website)
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* did it myself at several locations ...