Going on a very quick first time visit to Barca on Sunday, staying in the Eixample. Found a great site called Kids in Barcelona, which lists lots of little play areas etc.
it mentions a small 'beach'/pool in an enclosed courtyard called Torre de les Aigues, La Platja de Eixample, and I just wondered if anyone had tried it and was it just for under 7s (our kids are 8, 10, 11).