This unit far exceeded my expectations. I wouldn't usually stay at the same AirBNB when visiting a city again but I would definitely consider only staying with this host in Barcelona, at least when with a group.
Early check-in: The unit allows bag drop off at their office located about a 15 min walk east (or a few stops via metro). Their office is located atop a high rise where you can view large parts of the city. They will inform you if your unit happens to be ready early, which it was in our case. You can also leave bags in their office after the check out time (if you have a later flight, for example). You can also inquire to extra check out time if there aren't guests booked directly after you.
Tips: Our host at the office, Pierre, was super helpful in arranging any tours we were interested in.
Cleanliness: Units were super clean and put together.
Entry: Three sets of keys were provided for our group of 6. One set of the keys is needed to power the unit.
Pool: The rooftop pool is a nice amenity and has good views, especially during sunset. It's shared with other units in the building (which I assume are also under EnjoyBCN).
Laundry: We didn't use the laundry but it's located on the ground floor.
Extras: The fridge had food in it when we got there and food (fruit, croissants) was delivered to us over the weekend. There was so much left over that we couldn't finish it, but it was still a nice option.
All in all, awesome stay!