But I don't know where to go, can anyone recommend some night clubs or bars with more English-speaking people? 'cos my Polish speaking is still quite bad unfortunately.
One more question is, is there usually entrance charge for night clubs in Warsaw? Is there any ladys night?
There are usually a fair few English speakers in Sense. Also worth trying (although there is no bar to sit round like there is in Sense) is Warsaw Tortilla Factory, as is Essense. Bar Below can have a lot of English speakers too.
As for clubs, try Cinnamon, Opera and Platinum. None charge entry. Cinnamon has a ladies night on tuesday with free cocktails (only one kind though) for ladies all night.