The NIE (numero de identiad de extranjero) is one of the most important documents you need to have (for work, signing contracts etc) Here you find a short overview how to obtain you NIW If you know about any other changes please let me know!
So, for the record: How to get a NIE. You need: EU Passport Protected content of the Passport The Ex 16 form filled out Protected content (see attachment) € 6,70 in cash
First you have to go to: Oficina de Extranjeros Marqués de l'Argentera, 4, Porta 1 Protected content Tf. Protected content 44
It opens at 8 but you have to be there by 7:30 (by then there is already a huge line). Plan 1 to 1,5 hours to get through this first step. If you are late you will be waiting at least 2 to 2,5 h.
After this general registration you first have to go to any bank to pay the € 6,7 (There is a BBVA right next to the Comisaría de Barceloneta). Then go to
Comisaría de Barceloneta Pg. Joan de Borbó, 32 BARCELONA (Police station in Barceloneta)
there you will have to present the document you obtained before and your passport. And then (believe it or not) they will print you the NIE document. There will also be a line but much quicker.