The Real Mens Club actually has two entrances. There is an entrance right next to Bistro Praha, which when you enter you have to take the elevator immediatly to your left. When you enter the building, you are face to face with the kitchen and while waiting for the elevator might come in contact with some kitchen staff. This entrance in the summer doubtfully would not be very discreet, since it is right next to the patio area of Bistro Praha. Also this elevator isn't the best.
There is a second entrance on the south side of the building, it is a lone flight of stairs going up several floors, but will take you to the Club. The entrance isn't marked that well, but it is next to the other restaurant situated in the corner.
The Club is perhaps one of the more impressive studios for looks in the City, even if the outside and access is crappy.