We had 3 nights at Mario's apartment. It was very clean and had everything you might need for your stay.
Check-in was superb as we arrived earlier than expected and we were met by Mario's mother who explained the dos/don'ts and tips of things to do and see.
Apartment location was great,literally an easy 7 minute walk from the rail station and 20 minute walk to Seville centre, but plenty to see enroute in the old City. Although there was no balcony or outside sitting areas the apartment was very quiet which suited us very well.
Communication was great and very quick. We would definitely stay again.