Excellent apartment, with everything that you need. We stayed as a family of four with two children (one a baby). Like that you walk everywhere. Under 10 minutes to Cathedral and to Triana. Plenty of bars, restaurants and shops nearby. Seville is a perfect city to walk in. We never used public transport. Taxi to airport from the flat was around EUR 27 and took about 25 minutes.
Good that you can close doors to bedrooms so could leave kids to sleep. Also a bath tub helped for bathing the children.
On the first floor but steps were fine. Julie met us and gave us a thorough introduction to the flat, also gave us a map and highlighted places of interest. Heaters provided as we stayed in winter.
Would recommend and stay here again.