If you just need a place to sleep in Barcelona, this is a great apartment. Definitely more for groups than families - the bedrooms have pairs of twin beds, and while you can push them together, you'll be left without a bedside table or light for one side. Only one bedroom has any clothes storage, so you all need to be comfortable with each other. Ditto for the bathroom, which has no ventilation or toilet brush. The couch only seats 3, so no lounging about together in the evening. But why would you?
It is in easy walking distance of the Gothic Quarter, Sagrada Familia, El Born and La Cuitadella, and right on the Tetuan metro stop for everything else, so if you are in Barcelona for non-stop sightseeing and late nights at tapas bars, this is the place for you.
Someone will come to your door to collect the tourist tax. There was no warning of this, and the emails make you think they have already taken it from your AirBnB payment method, but you will need to have it in cash to hand over.