Nacho's appartment is simply amazing! Exactly as advertised, but feels even more spacious than shown on the pictures. A couple of things we especially enjoyed were the good matresses and pillows. They are all made of super comfy memory foam, which was a very welcome feel for our tired bodies! The flat is just a few steps away from many restaurants and flamenco bars, but inside the flat it is incredibly quiet. You don't hear a thing at night. Every room has independant airconditioning, also great when traveling with several people who don't agree on the temperature.
Everything was spotless, clean and the bathroom smelled nice. The bar directly downstairs serves some great local breakfasts. One nice convenience was the fact we had a personal parking spot in the underground garage. If you travel with a rental car, you know how difficult it is to park a car in most cities.
We were welcomed by Nacho's cousin, who had been waiting for us for a long time and he still managed to make us feel welcome with a big smile. He was very enthusiastic and helpful (and cute! :)), showing us around the flat and pointing us in the direction of Sevilla's main attractions. They are all within walking distance too, so the location of the flat is top notch. Not directly in the center, but just one bridge away :)
I highly recommend Nacho's flat to everyone who spends time in Sevilla.