Resumé: recommended!

The apartment was very nice, clean, location amazing (literally in the heart of Gracia, few metres away from a lovely square with coffee places, where - seated outside - you begin and end each day) and communication with Romina and her colleagues easy.

The only minor issue was 50 EUR fee for late check-in (after 23:00) fee. However, given the legal obligation to sign in person documents in the same way one does in hotels, one can understand the necessity of additional cost related to somebody's travel to the flat at night. And one can hardly blame flat-owners for higher bureacracy than in Berlin or other places.