Living in Barcelona
This is the miscellaneous section with all the bits we can think of, but haven't quite found the right space for yet. Things like using public transport, bicing and concerns like crime and theft.
For instance, if you are coming to Barcelona and want to get from the airport to the centre by train and you are planning on spending two or three days here using public transport, then buy a T-10 travel ticket at the airport (€6.90), rather than a normal single ticket, or worse several single tickets if there are a group of you.
The T-10 is the carnet ticket, valid for 10 single journeys and covers a wider area than the normal metro tickets (for instance it extends to the airport), includes buses, metros and trains and much much more useful it is multi-personal - that means it can be used for several people on the same journey. If there are two of you for instance travelling from the airport, buy one T-10 then use the one ticket twice - use the ticket to let the first person through the barrier, then use the same ticket to let the second person through the same barrier - travel times are stamped on the back. You now have 8 journeys left for the rest of your trip.
Quick note: on public transport travel is free for under 4s (also entry to museums is free for under 7s).