This is Xavi from Spain, currently living in Barcelona. I am 29 years old and I can teach you Spanish, Catalan and English (to B2 level) (IELTS 8). Furthermore, I am studying Chinese aswell HSK3.
I think that enthusiasm for what you do is fundamental, since that enthusiasm is key and spreads to those around you. Language learning and linguistics in general have been for me a hobby that over time has become a professional activity. Adaptation to the student is the great advantage of the individual class and enhance all linguistic skills, especially oral expression and comprehension during class.
Moreover, I have got some volunteering experiences with teaching English and Spanish in South Korea, Guatemala and Uganda.