Carlos is a very nice, lovely and helpful person.
The apartment is located close to the Parque Maria Luisa, immediately across the river Guadalquivir. The distance from "El Arenal" neighbourhood is about 20 minutes walk. There are a lot of free parking spots in the nearby.
NOTE: The phone contact that Carlos gives is NOT a mobile number but a landline phone number, so don't text to that number (it cannot receive SMS), but call him.