I lived in David's apartment for over 2 months, with 2 friends. The apartment is perfectly located (2 minutes away from Palos de la Frontera station, on line 3 which goes directly to the centre in 3 stations), very close to shops (pharmacies, Lidl, Dia, etc), and superbly equipped (dishwasher, washing machine, kitchen equipment, etc, all brand new !).
The flat was new when we arrived, which is ideal! The apartment is perfectly suitable for 3 people (3 bedrooms with a double bed each), even for long stays.
We loved having the possibility to contact David or his sister Sara at any time throughout our stay, in case we needed some information. They were very reactive and accomodating, we thank them for everything.
We look forward to coming back to Madrid after such experience!