Everything was allright, Natasha was very nice and helpfull even though we come quite late (and later than expcted), her cat was surprising and a bit crazy but still cool.
Only the location isn't that good: not a bad district (neither a cool one) but outside the center (and the nice barrios), you'll need to use the metro for everything.
Barcelona's metro is expensive unless you take a ten tickets card.

Gracias Natasha!