Alberto's Apartment is amazing. In a quiet building, in the city center, the old part of the town Casco Antiquo, right behind the City Hall. The decoration is great, and it has everything you need for a short or longer stay.
The apartment was clean and ready when I arrived. The comunication with Albert was great, and he gave me a map and some hints about to do's and restaurants in Sevilla.
Thanks for everything Alberto.