We've had a great stay at the apartment and in Sevilla. Communication in advance went very smoothly. Vicente always answered very fast. His nephew Daniel met us at the apartment and explained us everything we wanted to now (like how to get to the city centre) and helped us getting a taxi back to the airport.
The apartment itself is well equiped, clean and in a quiet street, only a short walk from the centre (about 15 minutes). This was even managable for our 4-year old son. Definitely recommended!