The apartment is gorgeous and looks exactly like the pictures. It is walking distance from all important sites, grocery stores & delicious tapas places, yet quiet and calm. We were 3 ppl, and while it was perfect for us it may be a bit tight for other people.
Carlos and his wife welcomed us warmly and took their time explaining the best sightseeing routes and restaurants, they know their tapas believe me ;)
I recommend this place 100% and will definitely stay here next time i'm in Seville.