I've stayed in several different AirBNB's in Barcelona and this was the best. Not only is Rachid very communicative and helpful and friendly, but it's a great apartment. It's large and comfortable and very well equipped. There are french doors in all rooms so you can get lots of fresh air, but if it's too hot or cold outside, the air conditioning units in each room work great and are almost totally silent. It's been remodeled to a very high standard, without losing any of the authentic charm of an older building.
The shower has a choice of an overhead rainfall shower, or a smaller wand if you don't want to get your hair wet. The bed is very comfortable, closet space is abundant, WiFi works great, and they even provided a few plugs with adaptors for American style electrical plugs. I had a converter with me, but this was great for being able to charge a few things at one time.
There is even a washing machine in a closet on the rear balcony. I'd been traveling well over a .week when I arrived, so it was great to be able to do a load of laundry.
The street where it's located is a pedestrian only area with lots of bars and restaurants so you've got amazing choices just steps out the front door - or the Gothic Quarter is a quick walk away.
The only thing I'd suggest people consider is that there is no lift / elevator. It's technically on the 3rd floor - but someone you go up a flight of stairs and you're at the "Entresol", up another flight of stairs and you're at "Principal" and another flight of stairs and you're actually at the first floor. So by American logic the apartment is on the 5th floor. I found it helped justify having an extra beer and some tapas - but if you don't like stairs, you should think about it twice.
Overall this is a great space, and a wonderful host. I would highly recommend booking it.