I don´t know about their July rates, but the H10 chain is getting pretty good reviews. They have remodelated their hotels, and you might like to have a look at them : http://www.h10.es . They have a beautiful place right in the Plaça Catalunya, although their hotel by the Olympic Harbour (a bit far away for the Convention Centre, I know) sounds tempting with its top floor swimming pool ...

Kind regards,

Covadonga Bilbao - Spain