Secured parking. You can find them on google maps by Motorhome parking in Barcelona. When we got to the gates security guard showed us our parking spot and gave us a ticket. We visited the city (8 min by foot to the Navas metro station) and came back in 6 hours, payed around 23 €. Worth the money because the whole parking place and guards makes you feel safe for your van/motorhome. 2,9 m height max.