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Yelp
My boyfriend and I were in Barcelona at the end of May for Primavera Festival and had one morning at the end to try and cram in some of the sights. I'm really happy we decided to hire bikes, because beforehand I'd had no idea 1) how beautiful and varied the city is or 2) what amazing cycle lanes it has - we only had to go on a road once!
The people at BornBike were extremely helpful and friendly, taking the time out to suggest good routes for us to use and making sure we were comfortable on the bikes. We were able to leave some larger luggage at the shop if we wanted, and I was surprised by how cheap it was to hire the bikes - we paid £6 each for a couple of hours I think and they were brand new and pretty comfy.
In our allotted time we managed to get around much of the city, from the beach to the park to the city centre and back again. It was a really memorable way to spend our last few hours in Barcelona and I'd say getting out and about on a bike is the top thing to do in the city, you'll really miss out if you don't give it a try.