This urban beach is always busy and popular especially among students and water sports lovers. You can also go on a kayak excursion along the coastline from here.
The beach offers all the usual services - showers, toilets, lifeguards, beach umbrellas and even Wi-Fi. Part of the beach is clothing-optional.
Wikipedia https://fr.wikipedia.org/wiki/Plage_Mar_Bella
More information at Visit Barcelona http://www.barcelonaturisme.com/wv3/en/page/1117/mar-bella-beach.html
Address Passeig Marítim de la Mar Bella, 126, 08005, Barcelona
Coordinates 41°23'54.176" N 2°12'44.042" E