We stayed here for a few days in July. The apartment makes great use of the space. Loads of rooms, very comfortable and the living room is just brilliant - loads of seating space, and double height ceilings!
downstairs - the master room is a very good size and comfortable, the others are more compact (but not tiny) and I suppose that is the compromise in a very central location.
upstairs - they have cleverly weaved in a second level for two more bedrooms and a bathroom upstairs. The rooms are a great size but very low ceilings... for sleeping this is perfectly fine. My girls did not even notice.
The location is superb. It is a few meters from the Paca Catalunya but as we were at the back there was no noise at all. This was as central as I would like to get, right beside the main restaurants and shopping areas without being on the Ramblas.
Highly recommended.