Main source of funding:
An ERASMUS grant
Other sources of funding:
I didn't want/need to work
Personal spending habits
I spent more on accomodation, because the room I got was a bad deal, but I didn't know any better when I got it, and speaking very basic Spanish only didn't exactly help either.
I spent more on Nightlife and Travel, because I went out more (Barcelona does that to you) and did more travelling (you would obviously want to see more of the country you're staying in if you're there for a year). Travelling within Barcelona (public transport) is fairly cheap though.
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Overall, Travel, Nightlife, Housing:
was more expensive than at home.
was the same price as at home.