Overall we would not stay here again. Check in was smooth and the host was very responsive with concerns about a dirty shower, he even came over to clean it himself. The showers were more an issue of drainage, not that the apartment was actually dirty, although there was dust under the beds and on the baseboards.
The apartment was very spacious which was great for 6 people. The beds were very uncomfortable which made for hard nights sleep. Only 1 towel provided per person for 8 nights is a little ridiculous, although it does say 1 per person in the listing. We had to buy our own towels because the washing machine didnt have a good rinse cycle and couldn't dry fast enough. We left the towels at the apartment for the next people. There was a sign up on the terrace asking us to not touch towels and sheests that were hung out there. We could have used the extra towels and were not able to use the porch since it was occupied by clothes racks. We had to buy our own toilet paper because only 2 rolls were provided. The Wi-Fi was spotty and had to be reset a couple times a day. Just things to be aware of.
10 min walk to the metro to bring you to the center of Seville which is a much nicer area than Nervion.