Finally discovered that little secret bar. You go down a staircase and a wooden wall gently slides away, giving you access. The bar is small, packed (mostly foreigners), noisy and smoky. Good ambiance and good beer, including some strange cocktails.
As the owner’s card says, “I’d tell you where FUBAR is… but, then I’d have to kill you. Cool!
Hint: visit www.fubarpeking.com

Could not resist the big cocktail just to take the container home.
Other hint: if you look for a great and cheap hotdog (with all the trimmings, 20 RMB), head for Stadium Dog, Workers Stadium door 10-11.
The bar is on my “OK” list, contrary to others.