My Beautiful Parking started out as a parking, expanded with rentals and now it seems like they have a whole empire of fixie bikes. MBP is deservedly popular, as rental prices are reasonable and staff dedicated cyclists.
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There are probably cheaper options out there, but the bikes here are well-maintained and you have many options. They also sell bikes and have tons of accessories. Another recent addition is bike tours of the holiday island Menorca, just a few hours by boat from Barcelona.
It's a bit off a hipster trap, yes, but staff are friendly and the bikes are good. Rentals start at 2 euros.
Mon-Tu: 11:00-20:00
Sa-Fr: 11:00-21:00