Minola bar is the skate bar, it's in la ramblas, pretty mcuh every skateboarder you run into will be able to point it out.
don't really have too much tips on living situations, when i was there, i was there through a friend of a friend so we kind of got hoooked up. maybe check Loquo? Loquo is like the spanish craigslist, because they don't use Craigslist out there, but there's definitely apartments and stuff, maybe you'll find something dope.
take your girl up to the Tibidabo mountain lookout to get cute, check out the Gaudi park and the bigass motherfuckin' church for sure. you and all the homies coming up should go out to club Razzmatazz, which is an enormous club that lasts all night, that will probably be really unforgetable as it's one of my favorite memories from barcelona.
as for a miniramp, the name of the skatepark escapes me, but its at :26 in Stu's Feed the Need part
http://www.youtube.com/watch?v=aXk37triRO0, that place is pretty jank, but i can honestly say when i was there i don't think i touched a really legit mini ramp the whole time without going way outside of the city.