A nice apartment in a quiet residential area. Transport is needed to get to areas with shops, restaurants and bars but thankfully there Llacuna metro station is 2 minutes away. I'd advise getting the "Hola Barcelona" travel card, which lets you travel on the metro, buses and trams.
Yaiza was really helpful and friendly, and I'm very grateful for communication in English as my Spanish it's prey much nonexistent.
The check-in app is pretty good, although I failed to realise I had to hit the key icon on the home screen to activate the Bluetooth door unlocking feature (user error). There was meant to be a key card in the apartment but there wasn't, and inviting the other people I was with to the app didn't work, so we couldn't split up and I was paranoid about my phone battery.
The apartment could maybe do with a paint touch up in couple of spots but the beds were comfy, the showers are good and there were plenty of towels. Didn't try the pool as we only really had one day of nice weather and someone else was having a party up there.