Oscar's apartment was spacious, modern and bright. His cousins (who gave us the keys) were super sweet and helpful when we reached Sevilla.
The apartment is slightly outside the old town, but there are good long walks towards the Santa Cruz barrio - one through the old town via Macarena (we discovered a lot more because we walked) and another along the river.
Only bummer was that there was no wifi in the apartment. Apart from that, we had a great time in Sevilla and enjoyed our stay in Oscar's apartment.