Just got back from there last week.
Don't stay in hotels, rent an apartment!
http://www.barcelonettasuites.com
Barcelonetta Suites was wonderful! I stayed at the one called Carmen and it was a true pleasure to stay there. Barcelonetta is a 2 min walk from the beach as well and about 10 minutes to the old city. The place looked as if it was recently redone and everything was logically laid out. The guy who gave us the keys was a really nice German guy who was really helpful.
Cost 95 euros a night and FREE WIRELESS!
I AM GOING TO BUY AN APARTMENT IN BARCELONETTA!!!