Really wonderful experience! Alberto responded very quickly and his place is better than described. It's very easy to find (located in a well known plaza) and centrally located, you can walk to most attractions / popular restaurants in 10 min or less! And around the corner less than 1 min away you can find El Rinconcillo, one of the oldest, most well known tapas bars in Sevilla :) The apartment itself is also wonderful, very clean and beautifully decorated with nice modern touches. It's on the ground floor of a very nice house, with full privacy and plenty of space.
Alberto was a great host, we experienced a delay in arrival due to flight issues but he was very gracious and accommodating. Overall amazing experience, we hope to be back soon!
Traveler tip: Plaza de Espana and Real Alcazar are a must, so beautiful! Don't bother taking taxi, we thought it looked far on the map but it's actually a quick and very beautiful walk from Alberto's place :)