The Good: Apartment was exactly as described, good location, super accessible to all the good parts of Barcelona. The apartment was comfortable and easy to find. Laundry/Washer in the building was a huge bonus.
The Bad: No shampoo or shower supplies. I know it seems kind of elitist to expect these things but it was honestly the first time I've ever had to buy my own and it was a bit jarring.
The Weird: After booking you're contacted by a third party by email, who'll ask for your travel details. After that you're asked to call a completely separate person on the day that you arrive to actually check-in. It's kind of a weird system and I would've preferred to communicate through the app instead of through three separate mediums.
They warn you of this in the booking, but I didn't expect how jarring it would be to have to pull out cash to pay for the tourist tax. The last thing I wanted to do after a long journey was to fumble around for change to pay. What if I didn't have any cash on me at the time? Just charge a little more for the booking so I don't have to think about that.