Walking: take San Fernando street, Puerta de Jerez, San Telmo Bridge, Betis Street and turn at Juan de Lugo to you arrive to Rodrigo de Triana (is the fourth street). It's about 20 min. walking.
Metro:take the Metro in Prado de San Sebastián stop (1,30€) to the Plaza de Cuba stop. Fron there take Pages del Corro street to you arrive to Luca de Tena street (near the Albahaca restaurant). Go in the river direction and Rodrigo de Triana is the next street.