Most of the people who have been Erasmus during a whole year, know what I'm gonna tell.
Those who are Erasmus since September to June, have to overcome a handicap. Many students are Erasmus just during a semester, so they have to leave their friends soon.
I arrived to Finland the first week of September and I met many people that I didn't know before, but they would be soon very good friends of mine. After 3 or 4 months, just a few of them would stay with me, in the same place where we met each other. The rest, would leave and probably we wouldn't meet again, in the future. And so was it, during the latest weeks of December, many of my best friends left Finland, and in January they didn't return.
After my holidays in Spain, I came back to Finland, at the same place where I was enjoying with my friends. It was the same place, but not the same people. It was wired. First days were complety wired! Who were those guys tooking up my friends place? Them, the beginners, step by step were becoming my new friends, my new best friends.
Therefore, erasmus friends, doesn't matter the place you are, the most important thing is the people beside you. Enjoy each detail of them, doesn't matter their country, doesn't matter their language. Each and everyone of them, always will be your Erasmus friends.