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.
Language development: 5-6 years. Language development in children in the early school years sees kids learning more and longer words. They get more skilled at putting words together in new ways. At this age, they also become more familiar with how language sounds, and how sounds combine to make words.