Excellent general information:
www.barcelonaturisme.com
www.bcn.es/turisme/castella/turisme/welcome.htm

Currency - money

The euro is the used currency in Barcelona and Spain.
Click here to convert your currency into euro or vice versa:
http://www.xe.com/ucc/es/

Bank hours are generally from 8:30 h to 14:00 h, though many change establishments, mainly around the Ramblas, have very flexible opening hours. Cash machines are widespread.

Tap water

The tap water in Barcelona is perfectly safe to drink, though not always tasty because of the chlorine. Bottled water is quite cheap and for sale all over the city.

Electricity

The standard current used is 220V 50hz, with 2-pin plugs.

Time

Barcelona applies the Western European time schedule, adapting the hour at the Winter and Summer schedule

Telephone

The country code of Spain is 34.
To make an international call when you are in Spain, first dial 00 and then the country code followed by the number.
The city code of Barcelona is 93. Make sure to always form this number when ringing a fix number, even when making a local phone call within the city.