We stayed at the apartment for a little over a month. Great location, not in the tourist center but still very convenient. The apartment has a big living room with two small bedrooms. The internet is very fast and stable. When we arrived, the couch was broken (from the previous Airbnb guest) and the host replaced it with a new one in about a week's time. Overall we had a pleasant stay there.
A few things to notice. On the Airbnb listing it mentioned the place has an oven, but it doesn't. It has a microwave but not an actual oven. When we arrived, the host was still running laundry in the apartment and the pillow cases and bedsheet in our bedroom were a bit wet. When the host checked us in the laundry machine was still running and we ended up taking the bedsheet out and hang them dry. Looks like they were in a rush to clean from the previous tenant. During the month long stay here, we supplied our own amenities such as toilet paper and dish soap. The host did offer to clean the apartment for us but with a fee. Given Barcelona's overall very high Airbnb rental pricing, we think this place is worth the value.