The good definitely outweighs the bad. The location is great. You can literally look into the back of Boqueria from the living room window. Keep in mind that you are located at probably the most crowded street corner in Barcelona, so if you are looking for quiet or a location away from the crowds, this is not the place. You will hear street noise until very late at night and again very early in the morning when the market is getting its deliveries, but that never bothered us.
The air conditioning was exquisite! This was our second trip to Europe this summer and the Airbnb we stayed at in London was unbearable. There were no issues in this apartment and after hot days in Barcelona, we were always happy to come back to a cool apartment.
Now for the bad. I had initially requested an early check-in, but understood they had other guests the night before. They could not accommodate the early check-in, so we waited until 15:00 to check in. Unfortunately, the apartment was still not ready. I called the host and was told they would check with their cleaning team and call me back. They never did and we had to wait almost an hour for the place to be ready. Communication was a big issue. Prior to our trip, I had messaged the host about several issues. Days went by without a response until I needed Airbnb to intervene. During the week we were there, we had several, relatively simple, issues where it was hard to get a response. First, the bathrooms and one of the bedrooms had some ants. I was told a member of the cleaning staff would come in the following day. The woman came and said she would be back in 10 minutes to clean the bathrooms (as opposed to spraying any kind of insecticide). We waited an hour and she never returned and I didn't want to waste any more time. I never heard anything else about it. I also inquired about where to throw garbage in the building. I was told that information was already communicated in the house rules, but there was nothing to be found. It's unfortunate that the host could not be more responsive.
As other guests have mentioned, the flooring leaves a lot to be desired. We all wore socks or flip flops at all times due to the cracks and chips. It's a shame because a little investment in the upkeep of the property would go a long way.