Sebastian's apartment was perfectly what I expected, i.e. bright, clean and calm. No more, no less.
The neighborhood is also really nice, especially "Alameda de Hercules" square - lots of tapas bars, restaurants and convenient stores. You will meet mostly Sevilla locals who are really cool and smiley, unlike Centro or Santa Cruz which are more touristic spots.
So if you are a couple and want a nice place to stay in for a few days, think about Sebastian's apartment.