What is a language tandem
Language tandem is a form of language exchange in which two people meet each other in order to improve their language skills by teaching their mother tongue and learning a foreign language from a native speaker at the same time.
Language tandem is learning languages by the informal way, meeting people from different cultures, making international friendships, free and fun at the same time. It is definitely worth it. Go for a coffee, grab a beer or do something specific in order to learn new words and phrases in different situations (e.g. horseback riding, playing board games).
It depends on you how often you will meet, share and learn new things. Also it depends on you which form you will use to do that - online, personal meeting, informal or formal.