June to August in Europe is known as High Season (which means you can expect wonderful summer weather but the downside is quite a few crowds). Any destination in Europe will be a great destination during high season.
If you really put your mind to it, and constantly expose yourself to a language then you may find that you can speak it with relative ease within about 6 months, although as mentioned before, you would really need to be living in a country that speaks that language in order to get to this stage.
Compare the figures on the duration of instruction compiled by the U.S. Government agencies to the average number of class hours per year in an average college language course. A typical college year is 9 months, or 36 weeks. A typical language course is 3-5 hours a week, or 108-180 hours per year plus preparation outside of class.