We had a great time at Albert's flat. We were four of us including two kids. Albert and his aunt were very nice and helpful.
The flat is very close to the metro station Poble Sec. From the station, you can go directly to lots of famous areas such as Catalunya, Liceu (Boqueria market), and Gracia (Casa Batillo, La Pederea). There are several supermarkets and bakeries near the flat.
It is the flat that is convenient and comfortable. The view was great. At the balcony, you can see even Sagrada Familia.
Albert, thanks a lot. ^^