Room Mate Hotels
This great, modern Madrid-based chain has hotels all over Europe that are great for budget travelers; their properties all have nice design (especially the bathrooms), good beds, and friendly staffers. There are two hotels in Barcelona—Emma and Pau—and both are brand new, with good locations. My personal favorite, though, is the Emma, which is just two minutes from Passeig de Gràcia. Rooms here cost about $90 in high season.