I loved this apartment! It's like a pocket-penthouse. Smallish but the layout is perfect. There are windows/balconies/terraces on 3 sides so the apartment gets lots of sun (really great for a winter stay) and there are nice views across the rooftops. The apartment is on the top floor so it's very private and quiet. I slept really well.
Loved the Gracia neighbourhood. At one end of the street you'll find all the fancy designer stores in Passeig de Gracia - at the other end it's a traditional residential neighbourhood with a sprinkling of hipsters. Lots of shops and restaurants on the doorstep. There two pretty squares with outdoor seating just around the corner.
The apartment does get a bit cold in there winter. There are sensors on the front door and the heating turns off when you go out so it can feel a bit cold when you return from a day out. Bring slippers or indoor shoes and you'll be fine.
Loved my stay in Barcelona and this apartment made it feel extra special.