What are the best cities for learning English?

Hi everybody,
I’m going to spend 10/16 weeks in USA and I’m wavering between:

Washington, San Francisco, San Francisco-Berkeley, Chicago and Boston.

What is/are the best city/ies where a foreign guy could improve better his English? (accents, slangs, ect.)

Many thanks to everybody and 10 points to the best!

PS: My weeks will be composed by Intensive courses and TOEFL preparation.

Washington, Boston.

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