The apartment is an absolutely excellent base for exploring Seville. It's right in the middle of Santa Cruz, the historic Jewish district of tiny cobbled streets. It's pedestrianised outside the apt and very busy with pedestrians, musicians, a lovely restaurant, and all the hustle and bustle of an old city. There's constant background noise that I found soothing and interesting. Brought ear plugs (per other reviews) and never used them.
The interior is nicer than the photos, it's a cool space. Kitchen was not well equipped and we needed to ask for a couple of things, but the host was very quick to provide. The bedrooms have no storage to unpack your bags to. You definitely need to be comfortable climbing stairs. Heating and AC worked well but we barely needed it. The balcony was a gorgeous suntrap.
Overall this was a magical airbnb and I'd love to come back.