Hello mate,
stayed in the catalonia ramblas last month. Very nice, just B+B but didnt really spend too much time in there other than that really as there is so much to do. Its 2 min from the main square, plaza catalunia, and loads of bus stops for the tourist routes etc. Also just near the airport bus route which is very efficiant and only 5 euros each way rather than 30 euros in a taxi.
Any other info needed, ask away.
Muffster.