I would also be interested to see what people think about Berlitz and the methods that they use.
Taking private lessons is an effective way to learn a foreign language but make sure that your tutor is experienced and/or qualified. Also sometimes you may not 'click' with your tutor and your way of learning might not be compatible with their teaching methods. If you haven't signed up yet see if they offer a free or reduced price class so that you can see what your assigned tutor is like.
Enjoy your lessons, I hope that they work for you.
Jack
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