House swap Cadiz/Madrid?

Anyone in Cadiz who’d like to house swap for a week or two in Sept? We’re in a great part of Madrid, very close to city centre but with an open, sunset viewing – close to public transport – easy access to freeways, two bedroom apartment with security guard. Close to public swimming pools and a very large park. We’re looking for something for 3 pax – 2 adults and a kid – not fussy, just somewhere to crash at the end of the day and preferably not too far from beach, though not a requirement.
If you’re interested in renting rather than house swapping, also an option.