Carlos is a great host. He makes everything for you to get comfortable and feel like home. He knows a lot about Barcelona as a tourist guide and gives many useful tips.
He is also really well educated and open minded.
It was a really nice experience and Carlos is a very nice person to meet
The other roommates also respected the rules and everything went smoothly.
Around the flat you will find anything you need within 5 minutes : plenty of bus/metro stations, supermarkets and the gym at Bac de Roda is just amazing- you can easily get a temporary access to enjoy it. The beach is also within walking distance if you like.
[Tip to know: in Bcn most of the cash dispensers will charge between 2 and 3 € per withdrawal whatever the amount , which surprised me a lot. Local people are crazy about that (I understand). For me it was ING & Banco Popular. Ask your bank if they have agreements to authorise withdrawals without fees before you leave your country.]