We had a fantastic stay at Carles's 'Heritage Building' terraces - we ended up staying in both 1 and 2! Perfect location for exploring Barcelona, everywhere is easily walkable but the immediate area is pretty quiet. Beautiful big terrace for those sunny days and a lovely large space to hang out.
We were two adults and two children (8 and 12) and had plenty of space. The boys loved the lift / elevator :-) It is worth being aware of the high balcony sleep space, the ladder to get up and down can be a bit scary for younger children but my 8 year old loved having the privacy, like his own little 'fort'. Would definitely stay again!