I had a nice stay at Maria Jose's apartment. MJ's English is perfect, which makes it very easy to communicate. The size of the apartment makes it affordable, and the air conditioning is a big plus. You will do a lot of walking in Seville, and it gets HOT in the summer, so it's nice to come home and turn on the A/C.
The apartment is located about 10 minutes walk from the nearest busy area--but that also works to your benefit, because there are a few really good restaurants nearby. About 15 minutes walk to the Cathedral and Giralda towers.
The air conditioner, and access to the roof to have a beer, were great. The shower is very small, but fine. Good stay!