I have never been to GHC but I did walk there from the No Ma metro station. It is about a 20 min walk. I had planned on going in but the place looked really sketchy. Now that was about 4 years ago so the place might have gotten better.
The crew club is pretty good. There is a lot of bb sex going on. But you have to go at the right time. Going late on Friday and Saturday after 11 is good. But you want to get a bigger room and then seem to be gone around 11 at night. The smaller rooms are really small.
The last time I was there was in March. I had about 6 guys in my room over the course of the night, but only fucked one of them.
BTW don't go early in the evening in the summer, it was really dead from 5 to 9 in the evening once on a Saturday.