We visited Barcelona on our (now annual) Eurotrip in 2016. Here is the quick take!

Visited: May, 2016
Days in Barcelona: 4
Travelled to Barcelona by: Plane from Amsterdam
Stayed at: NH Barcelona Centro

Favourite site: La Boqueria Market and the Sagrada Familia
Favourite restaurants: La Rita and Sagardi
Favourite Squares: Placa de Catalunya
Tours: Hop on, hop off bus
Must Do: Visit the Park Guell, Sagrada Familia and La Boqueria Market. We loved the hop on, hop off bus because we got to see so much of the city we wouldn’t have otherwise known about or made time for.
If you have time: Spend a day on the beach but beware of a ton of people selling things.
Day trips: None.