Wow, what a character bcnexpat was! The fact he tried to drown everyone's point of view with his own is reason enough to see that he'd hate anywhere he lives..!
Kako ste vi ineshinha? That's about it except for palachinka and kolodvor I'm afraid.. :-).
Rental prices in Barcelona are relatively high if you want an entire flat in the centre, but if you share or move further out you'll be paying much less. On www.loquo.es you'll find non-agency prices for flatshares and entire flats..
As for learning Catalan, the Ajuntament (Town Hall) teaches catalan for free as does the CNPL (http://www.cpnl.cat/xarxa/cnlbarcelona/). I don't think the CNPL is run by the ajuntament...
I moved from London to Barcelona, so the prices are incomparable (except for supermarket food - about the same price or cheaper in the UK).
Restaurant food at midday is a bargain (6-12 euros for a 2-3 course meal + coffee + drink) and there's much more free stuff to do than in many countries due to the weather and the fact that the catalans and their government are the most people/culture/experience-focused of anywhere I've been, even as far as decreasing the amount of (much-needed) housing to create public spaces. The result is that it feels like a city for the people, regardless of their wealth (housing aside). There's always something to do...
Public transport in Barcelona is varied, excellent and cheap as chips in comparison (chips in the UK are also cheaper). For example, buy a 10 journey travelcard for 7 euros or so, and each journey will get you to places outside Barcelona itself if you want, and each journey consists of an hour and a half's journeying on tram, train, bus or metro, with as many changes as you like (in 1 direction only! Though this means you can do a loop to travel to a location by bus and back by metro for the price of 1 journey). Another option is Bicing - you pay 24 euros a year online (bicing.com) and pick up a bike from one of the many stops to use for up to 2 hours at a time as often as you like. Lots of stops in the centre, less in the suburbs. They even do cars now...
Hope I haven't seemed too biased, but I really do love the city and people, and housing is becoming more obtainable (though still silly in comparison with the average wage): property prices have dropped about 20-30% and there are goverment schemes to part-purchase flats.
Cheers,
Steve from Norn Iron (would be good to see it in the list! :-)