As for Albertos apartment, I can say only best recommendations: Alberto is very kind, transparent and solicitous man. At first day he gave us water, bonbons and very important thing for tourists - a Barcelona map ! Alberto acted as an attentive and delicate person. That is why we are happy, that first experience of this kind of travelling was with Albertos support.
Speaking about flat - it is big, with good terrace, bright room with nice flowers on the wall. Location is right in the centre of Barcelona, near with famous Sagrada Familia.