Sadly our first experience staying in Barcelona was not pleasant at all.
Prior to our arrival we submitted all our information (4 people - email, passport info) to do the online check-in and be able to arrive directly to the apartment (otherwise we would have to arrive at their offices which are ~20 mins away from the apartment). However, when we arrived we had to wait half an hour to have at least one key and ‘til the next day for the wifi password. One of the airbnb’s bathrooms had an awful smell, the washing machine did not work properly, the heater was leaking, and there was barely pressure for hot water in one of the bathrooms.
When we were departing, the cleaning lady arrived half an hour before checkout, we used their lockers service but got locked out of the building with our baggage inside and they never resolved the issue.
Don't get me wrong, the place is nice to stay but is not worth the time it consumed us and the trouble.