Ignacio was very welcoming and helpful. A friend and myself stayed at the apartment and thought it was great: The rooftop terrace was fabulous for sunbathing with a glass of cava, we were right in the centre of the city and could walk anywhere we wanted to go and it was good value.
On Ignacio's recommendation we went to flamenco at casa de la memoria nearby which was absolutely fantastic and really worth seeing. I'd also recommend eating at El Panduro Banos for fabulous food and service (especially the beef which is 'melt in the mouth')
A slight downside is that it can be noisy at night with people partying and the street cleaning but I'd say that it's worth it to be so central to everything.
I would highly recommend this apartment for your stay in Seville.