We had to move to another place couple hours after arrival since there was a "funny" smell (possibly gas). Although I cannot confirm it was actually gas. It smell like it. Upon contacting the host to resolve this issue, he informed there is no gas on premises and there was nothing he could do about it. We then contacted Airbnb and they asked us to move to another place as a safety measure.
The apartment is located in the neighborhood of Triana, about 10 minutes walk from he Torre de Oro/ Puente San Telmo. The listing it self was not sparkling clean, walls were dirty and there was a bit of dust on the floor. Beds and rooms were good size and comfortable.
If the smell would not have been an issue, I am pretty sure we could have had a great stay. Otherwise, I can only speak for my experience during this short stay (4hours).