If you're in Barcelona, and want to see its nightlife, just rent a scooter and have a ride around. You'll experience all colours of this city. Here you'll find tons of bars and pubs to experience Barcelona's nightlife first-hand. For places for a visit read https://vesping.com/blog/what-to-do-in-barcelona/barcelona-tips/where-to-party-in-barcelona/ and visit tripadvisor to read reviews.