This is an amazing apartment in a wonderful location. It is in a local neighborhood with a very local feel. Close to everything. You do need to walk to get to the tourist part of town. About 10-15 minutes.
Within a 5 minute walk you can reach buses, metro (under ground city subway), trains to everywhere outside of Barcelona.
There are many many restaurants near by. Talking to some locals, this area is where people in Barcelona go to have dinner.
I can't say enough good things about the location.
The accommodation is comfortable for 6 people. 1 Double and 4 singles. 3 rooms. When I was there with my family, we did have some issues that were difficult. The internet did not work and it took some days to fix it. Actually, it never got fixed by the hosts. I had to use IT skills to kludge a work around that worked for us (Static IP address configurations).
One of the three AC units did not work. This was in the bedroom part of the house. When Barcelona heated up, folks had to sleep in the living room to survive the heat. Bedrooms were up to 90 degF. For us, that was only 3 days.
The expectation of the host is that the guests buy all supplies including dish soap, toilet paper, washing machine detergent, trash bags. There are many grocery stores close by if you need that.
I highly recommend you use AirBnB messaging for all your communications. The hosts do not respond to what'sApp.