We were made to feel welcome and settled easily into the apartment, which had a lovely, very well equipped, kitchen with everything that we needed for cooking some of our own meals.
The area was good and it was not far to walk to get to the sights. However, we like walking and so walked everywhere unless we wanted to go across the river, or to Huelva or Cordoba. Some people would find it a long way to walk to get to the Cathedral, for example. There were buses from just outside the apartment which run frequently so that shouldn't be a drawback.
Although we didn't use the bikes there is no doubt that Seville is a great place for cycling, with cycle lanes everywhere.
There were supermarkets, bars/bodegas all around us. People came out in the evening to walk their dogs or allow their children to play in the park which was overlooked by the apartment. Very pleasant.
We hired a car and were worried about the parking. It did mean that we had to drive around a bit a few times but we always managed to find somewhere. There is loads of on-street parking but also loads of cars.
We enjoyed our stay and found that the locals appeared friendly and helpful. Seville seems a very safe place to walk around late at night.