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.
SLA for Beginning Learners. Our most popular SLA course is for individuals who plan to learn one or more new languages while living in a cross-cultural setting. Most are planning for significant use of the heart-language of the host community. Requires approximately 3-4 hours per day for six weeks.