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.
The stages of language acquisition progress from babbling to one-word, to two-word speech in children. From there, children quickly begin using complete sentences, often by the age of two. Learning the complex aspects of language continues into the adult years.