We stayed here as part of hen do with 11 women. The house itself is in a converted warehouse and is a fantastic place for a hen party or a group of friends visiting Barcelona. The house is split into three sections - ground floor with 4 bedrooms, floor 1 with 2 bedrooms and the kitchen, living room & terrace with pool. There is then a mezzanine on the top floor with another bedroom the looks onto the kitchen. The house was fantastic for what we needed it for, and the terrace area was the perfect little sun trap. Supermarket is close by but I would recommend getting a food delivery by Mercadona on the first day as it'll stop you having to carry lots of heavy goods back from the supermarket.
The other houses next to us are also owned by the same owners and available to rent on Air BnB. They were quite noisy with other large groups but this didn't bother us too much as we were out most days and evenings. As others have said, the apartment is quite far out of Barcelona, but if you can get a taxi service then it is only around 10-12 euro taxi to the bottom of Las Ramblas. We used the MyTaxi app.
Mosquitos were quite bad at the end of our trip so I would also advise bringing some repellant if you are easily bitten.
Overall the accommodation was perfect for our needs and I would recommend it for anyone who is visiting Barcelona for a similar trip!