We had a great time at Marco,s place. The apartment is an old building , close to the city centre and next to a square with a playground , which was very useful for our son.
On nights and weekends was awesome to experience the neighbourhood get together around the bars and just enjoy a good time together with their friends and family.
Only issue, probably applicable to anywhere in Seville city centre is avoid driving. Quite hard to do and nearly impossible to find legal free parking. Come by train or prepay your car park and leave it out of the city ( there's one at the main train station which is just 6 euros per day )
Marco was pretty great. We had a bit of trouble to find the place and drive there, but he was very helpful to help us figure it out, and took me to a secret coin parking spot , which was good for the night . Thanks a lot for everything