We had a wonderful time in Maria's apartment, it is well equipped with everything one needs, even when staying as long as 5 weeks as I did. The apartment is perfectly located in a quiet street in the old town, the next supermarket is 3 minutes away, and a big Mercadona supermarket is 10 minutes away. The apartment is close to some local bus lines, and the Plaza de Armas bus station for long distance travel is about 10 minutes away.
Maria is a great host, during the 5 weeks she regularly asked if all was well which made us feel really welcome. She also had a lot of recommendations for restaurants and bars (all of them nearby). I hope to come back again to Maria's place and spend more time in lovely Sevilla! :-)