We have stayed in many air bnb apartments in Barcelona and this is a good one in my opinion. Here's why:
1. Great friendly host.
2. Comfortable beds and a/c.
3. A kitchen that you can actually cook in.
4. Very clean.
5. Also has an elevator if that is important to you.
6. Great location- in the heart of everything without being in the super crowded area.
If you are a foodie or healthy this is also a great place. You have a traditional neighborhood farmers marketplace and several organic stores for groceries (gram in front of la conceptcio farmers market as well as a dairy farmer right around the corner). You are also near many famous restaurants and can get a variety of types of food experiences within minutes of the apartment.