We spent a great four nights at Rocio's appartment. It is well laid out and comfortable. It was spacious for two, however it might be a push for four unless you are really good friends.
The appartment is set in Triana and is within easy reach of the main tourist routes, but we really liked the feel of being in Spanish neighbourhood. At times it could be noisly from the street but it didn't last long and we felt it was more of a lure to get outside and get involved.
A really enjoyable stay.